#include<iostream>
#include <string>
#include<algorithm>
using std::endl;
using std::cin;
using std::cout;
using std::string;
int main()
{
#ifdef LOCAL
	freopen("input.txt" , "r" , stdin);
	freopen("output.txt" , "w" , stdout);
#endif
	int T;
	cin >> T;
	string a , b , sum;
	for(int cases = 1; cases<=T; ++cases)
	{
		sum.clear();
		cin >> a >> b;
		cout << "Case " << cases << ":" << endl;
		cout << a <<" + "<<b << " = ";
		int c = 0 ;
		reverse(a.begin() , a.end());
		reverse(b.begin() , b.end());
		int alength = a.length();
		int blength = b.length();
		int length = alength;
		//使两个字符串的长度相等，补齐零
		if(alength < blength)
		{
			for(int i=alength; i<blength; ++i)
			{
				a += '0';
			}
			length = blength;
		}
		if(blength < alength)
		{
			for(int i=blength; i<alength; ++i)
			{
				b +='0';
			}
			length = alength;
		}
		//进行加法计算，c为进位
		for(int i=0; i<length; ++i)
		{
			int temp = (a[i] - '0') + (b[i] - '0') +c;
			c = temp/10;
			sum += (temp%10 + '0');
		}
		//最高位的进位如果不为0的话则进位
		if(c!=0)
		{
			sum += (c +'0');
		}
		//结果转置
		reverse(sum.begin() , sum.end());
		cout << sum << endl;
		//控制最后的那组数据不再输出空行
		if(cases != T)
		{
			cout << endl;
		}
	}
}