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           using namespace std;class integer{ friend istream& operator>>(istream& is,integer&); friend ostream& operator<<(ostream& os,const integer&);// friend bool operator>(const integer &,const integer&);// friend bool operator<(const integer &,const integer&);// friend bool operator>=(const integer &,const integer&);// friend bool operator<=(const integer &,const integer&);// friend bool operator==(const integer &,const integer&);// friend bool operator!=(const integer &,const integer&);// friend integer operator+(const integer&,const integer&);// friend integer operator-(const integer&,const integer&);// friend integer operator*(const integer&,const integer&);// friend integer operator/(const integer&,const integer&);// friend integer operator%(const integer&,const integer&);// friend integer abs(const integer&);// friend integer operator-(const integer& num);//public: integer& operator=(const integer &);// integer& operator++(); integer operator++(int); integer& operator--(); integer operator--(int); integer& operator+=(const integer&); integer& operator-=(const integer&); integer& operator*=(const integer&); integer& operator/=(const integer&); integer& operator%=(const integer&); integer(const char* s="0");// integer(const long long int& num);// integer(const integer& num);// virtual ~integer();//private: struct _int { public: _int(const char*str="0"); _int(const long long&); _int(const _int&); void show()const; ~_int(); _int(size_t,short); static _int add(const _int&,const _int&); static _int sub(const _int&,const _int&); static _int mul(const _int&,const _int&); static _int div(const _int&,const _int&); static _int mod(const _int&,const _int&); static void intcpy(_int&,const _int&); static bool big(const _int&,const _int&); static bool low(const _int&,const _int&); static bool equ(const _int&,const _int&); short *p; size_t len; }*p; bool sign;};integer::_int::_int(const char* str):p(0),len(1){ char* t_str=(char*)str; if(strlen(str)==0) { len=1; p=new short[len]; p[0]=0; return; } while(*t_str=='0')t_str++; if(t_str==&str[strlen(str)]&&*(t_str-1)=='0') { len=1; p=new short[len]; p[0]=0; } else { int t_len=strlen(t_str),t_sum=0; len=t_len%4==0?t_len/4:t_len/4+1; int index=0; p=new short[len]; string s(t_str); reverse(s.begin(),s.end()); string::iterator it=s.begin(); for(it=s.begin(); it
           
            0)temp/=10,t_len++; len=t_len%4==0?t_len/4:t_len/4+1; p=new short [len]; temp=num; for(int i=0; i<(int)len; ++i) { p[i]=temp%10000; temp/=10000; }}integer::_int::_int(const _int&other):p(0),len(1){ this->len=other.len; p=new short [len]; for(size_t i=0; i
            
             =a.len) { p1=a.p,p2=other.p,max_len=other.len,min_len=a.len; } else { p1=other.p,p2=a.p,max_len=a.len,min_len=other.len; } _int sum(max_len+1,0); int t_num=0; for(int i=0; i
             
              =10000) { sum.p[i]-=10000; sum.p[i+1]++; } } if(sum.p[max_len]==0)sum.len--; return sum;}integer::_int integer::_int:: sub(const _int& a,const _int& b){ int max_len,min_len; short *p1=0,*p2=0; max_len=a.len,min_len=b.len; p1=a.p,p2=b.p; _int sub(max_len+1,0); int t_num=0; for(int i=0; i
              
               1&&sub.p[sub.len-1]==0)sub.len--; return sub;}integer::_int integer::_int:: mul(const _int& a,const _int& other){ _int result(a.len+other.len,0);; for(int i=0; i<(int)result.len; i++) result.p[i]=0; int index=0; for(int i=0; i<(int)a.len; i++) { index=i; for(int j=0; j<(int)other.len; j++) { int mul=a.p[i]*other.p[j]; result.p[index]+=mul%10000; if(result.p[index]>=10000)result.p[index+1]++,result.p[index]-=10000; result.p[++index]+=mul/10000; if(result.p[index]>=10000)result.p[index+1]++,result.p[index]-=10000; } } for(int i=result.len-1; i>0; i--) { if(result.p[i]==0) result.len--; else break; } return result;}integer::_int integer::_int:: div(const _int& a,const _int& b){ vector<_int>v; v.reserve(10000); if(low(a,b))return "0"; _int res("0"); _int zero("0"); v.push_back(_int("1")); _int base(a); _int sub_num; while(!low(base,b)) { intcpy(sub_num,mul(v[v.size()-1],b)); if(!low(base,sub_num)) { ; intcpy(base,sub(base,sub_num)); intcpy((res),add(res,v[v.size()-1])); v.push_back(mul(v[v.size()-1],2)); } else if(equ(v[v.size()-1],"1")) { break; } else v.erase(v.end()-1); } return res;}integer::_int integer::_int:: mod(const _int& a,const _int& b){ vector<_int>v; v.reserve(10000); if(low(a,b))return "0"; _int res("0"); _int zero("0"); v.push_back(_int("1")); _int base(a); _int sub_num; while(!low(base,b)) { intcpy(sub_num,mul(v[v.size()-1],b)); if(!low(base,sub_num)) { ; intcpy(base,sub(base,sub_num)); intcpy((res),add(res,v[v.size()-1])); v.push_back(mul(v[v.size()-1],2)); } else if(equ(v[v.size()-1],"1")) { break; } else v.erase(v.end()-1); } return base;}void integer::_int:: intcpy(_int& dest,const _int&src){ if(&dest!=&src) { delete []dest.p; dest.p=0; dest.p=new short[src.len]; for(int i=0; i<(int)src.len; i++) dest.p[i]=src.p[i]; dest.len=src.len; }}bool integer::_int:: big(const _int& a,const _int& b){ if(a.len>b.len)return true; if(a.len
               
                =0; i--) { if(a.p[i]
                
                 b.len)return false; for(int i=a.len-1; i>=0; i--) { if(a.p[i]
                 
                  len; while(l-1>-0&&0==p[l-1])l--; printf("%d",p[l-1]); for(int i=l-2; i>=0; --i) { printf("%.4d",p[i]); }}integer::_int::~_int(){ delete []p;}integer::integer(const char* s):p(0),sign(0){ if(s[0]=='-')p=new _int(s+1),sign=1; else p=new _int(s);}integer::integer(const long long int& n):p(0),sign(0){ if(n<0)p=new _int(-n),sign=1; else p=new _int(n);}integer::integer(const integer& n):p(0),sign(0){ sign=n.sign; p=new _int; integer::_int::intcpy(*p,*n.p);}istream& operator>>(istream& is,integer& num){ string s; is>>s; num=integer(s.c_str()); return is;}ostream& operator<<(ostream& os,const integer&num){ if(abs(num)=="0") { printf("0"); return os; } if(num.sign==1)printf("-"); num.p->show(); return os;}bool operator>(const integer &a,const integer&b){ if(a.sign^b.sign) { if(a.sign)return false; else return true; } else { return integer::_int:: big(*a.p,*b.p); }}bool operator<(const integer &a,const integer&b){ if(a.sign^b.sign) { if(a.sign)return true; else return false; } else { return integer::_int:: low(*a.p,*b.p); }}bool operator>=(const integer &a,const integer&b){ return a>b||a==b;}bool operator<=(const integer &a,const integer&b){ return a
                  
                   =abs(b)) { t.sign=0; integer::_int::intcpy(*t.p,integer::_int::sub(*a.p,*b.p)); } else { t.sign=1; integer::_int::intcpy(*t.p,integer::_int::sub(*b.p,*a.p)); } return t; } }}integer operator*(const integer&a,const integer&b){ integer t; t.sign=a.sign^b.sign; integer::_int::intcpy(*t.p,integer::_int::mul(*a.p,*b.p)); return t;}integer operator/(const integer&a,const integer&b){ integer t; t.sign=a.sign^b.sign; integer::_int::intcpy(*t.p,integer::_int::div(*a.p,*b.p)); return t;}integer operator%(const integer&a,const integer&b){ integer t; t.sign=a.sign^b.sign; integer::_int::intcpy(*t.p,integer::_int::mod(*a.p,*b.p)); return t;}integer abs(const integer & a){ integer t(a); t.sign=0; return t;}integer operator -(const integer&a){ integer t(a); t.sign^=1; if(abs(a)=="0")t.sign=0; return t;}integer& integer::operator =(const integer&a){ if(this!=&a) { sign=a.sign; integer::_int::intcpy(*p,*a.p); } return *this;}integer& integer::operator++(){ return *this+=1;}integer integer:: operator++(int){ integer t=*this; *this+=1; return t;}integer& integer::operator--(){ return *this-=1;}integer integer::operator--(int){ integer t=*this; *this-=1; return t;}integer& integer::operator+=(const integer&a){ return *this=*this+a;}integer& integer::operator-=(const integer&a){ return *this=*this-a;}integer& integer::operator*=(const integer&a){ return *this=*this*a;}integer& integer::operator/=(const integer&a){ return *this=*this/a;}integer& integer::operator%=(const integer&a){ return *this=*this%a;}integer::~integer(){ delete p;}int main(){ integer a,b; int cas; scanf("%d",&cas); for(int i=1;i<=cas;i++) { cin>>a>>b; printf("Case %d:\n",i); cout<
                   <<" "<<"+"<<" "<<<" "<<"="<<" "<
                     
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