#include <stdio.h>
#include <string>
#include <iostream>
using namespace std;
string str1, str2, ans;
int main()
{
int n;
scanf("%d", &n);
getchar();
int count = 1;
while(n--)
{
cin >> str1 >> str2;
string x1 = str1, x2 = str2;
int len1 = str1.length(), len2 = str2.length();
string tmp;
//对齐
if(len1 < len2)
{
for(int i = 0; i < len2-len1; i++)
tmp = tmp + '0';
str1 = tmp + str1;
}
if(len1 > len2)
{
for(int i = 0; i < len1-len2; i++)
tmp = tmp + '0';
str2 = tmp + str2;
}
bool flag = false;
int i, id = 0;
for(i = str1.length()-1; i >= 0; i--)
{
int tmp = str1[i] + str2[i] - '0' - '0' + flag;
if(tmp >= 10)
{
flag = true;
char s = '0' + tmp % 10;
ans = s + ans;
}
else
{
flag = false;
char s = '0' + tmp;
ans = s + ans;
}
}
if(flag) //比如像9+1这种情况
ans = '1' + ans;
cout << "Case " << count << ":" << endl;
cout << x1 << " + " << x2 << " = " << ans << endl;
ans.clear();
count++;
if(n)
cout << endl;
}
return 0;
}