Problem Description：

I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.

Input：

The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line consists of two positive integers, A and B. Notice that the integers are very large, that means you should not process them by using 32-bit integer. You may assume the length of each integer will not exceed 1000.

Output：

For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line is the an equation "A + B = Sum", Sum means the result of A + B. Note there are some spaces int the equation. Output a blank line between two test cases.

Sample Input：

2

1 2

112233445566778899 998877665544332211

Sample Output：

Case 1:

1 + 2 = 3

Case 2:

112233445566778899 + 998877665544332211 = 1111111111111111110

AC Code：  

import java.util.*;
import java.math.*;
public class Main
{
  public static void main(String[] args)
  {
    Scanner input=new Scanner(System.in);
    int t=input.nextInt();
    int ans=1;
    for(int i=1;i<=t;i++)
    {
      BigDecimal a=input.nextBigDecimal();
      BigDecimal b=input.nextBigDecimal();
      System.out.println("Case "+ans+":");
      System.out.println(a+" + "+b+" = "+a.add(b));
      ans++;
      if(ans<=t)
        System.out.println();
    }
    input.close();
  }
}