#include<iostream>
#include<string>
using namespace std;
string sum(string s1,string s2)
{
if(s1.length()<s2.length())
{
string temp=s1;
s1=s2;
s2=temp;
}
for(int i=s1.length()-1,j=s2.length ()-1;i>=0;i--,j--)
{
s1[i]=char(s1[i]+(j>=0?s2[j]-'0':0));
if(s1[i]-'0'>=10)
{
s1[i]=char((s1[i]-'0')%10+'0');
if(i)
s1[i-1]++;
else
s1='1'+s1;
}
}
return s1;
}
int main()
{int t;
cin>>t;
for(int m=1;m<=t;m++)
{
string s1,s2,ans;
cin>>s1>>s2;
ans=sum(s1,s2);
cout<<"Case "<<m<<":"<<endl;
cout<<s1<<" + "<<s2<<" = "<<ans<<endl;
if(m!=t)
cout<<endl;
}
return 0;
}
这个模板感觉挺简单