#include
#include
#include
#define N 1000
using namespace std;
string bigmult(string a,string b)
{
intla,lb,lc,i,j,flag;
stringc="";
chart;
i=la=a.length()-1;
j=lb=b.length()-1;
flag=0;
while(i>=0&&j>=0)
{
t=a[i]+b[j]+flag-'0';
if(t>'9')
{
t=t-10;flag=1;
}
else flag=0;
c+=t;
i--;j--;
}
while(i>=0)
{
t=a[i]+flag;
if(t>'9')
{
t=t-10;flag=1;
}
else flag=0;
c+=t;
i--;
}
while(j>=0)
{
t=b[j]+flag;
if(t>'9')
{
t=t-10;flag=1;
}
else flag=0;
c+=t;
j--;
}
if(flag) c+=(flag+'0');
lc=c.length();
for(i=0,j=lc-1;i
{
t=c[i];c[i]=c[j];c[j]=t;
}
returnc;
}
int main()
{
inttest,k=1;
stringa,b;
cin>>test;
while(test--)
{
cin>>a>>b;
cout<<"Case"<<k++<<":"<<endl;
cout<<a<<" +"<<b<<" = "<<bigmult(a,b)<<endl;
if(test)cout<<endl;
}
return0;
}
