HDU1002

import java.math.BigInteger;
import java.util.Scanner;

/**
 * Created by mac on 2018/11/30.
 */
public class Main {
    public static void main(String[]args){
        Scanner input = new Scanner(System.in);
        //java中的大数字用BigInteger表示
        BigInteger a,b;
        int n = input.nextInt();
        for (int i = 1; i <= n;i++){
            System.out.println("Case " + i +":");
            a = input.nextBigInteger();
            b = input.nextBigInteger();
            //大数字的相加用add函数；
            System.out.println(a + " + " + b +" = " + a.add(b));
            //控制最后一个输出不换行
            if (i < n)
                System.out.println();
        }
        input.close();
    }
}