A-B Problem Plus

Time Limit:1000MS  Memory Limit:65535KB
Description:
I have a very simple problem for you again. Given two integers A and B, your job is to calculate the result 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 = ?", ? means the result of A - B.Note there are some spaces int the equation. Output a blank line between two test cases.
Sample test:
Input
3
9 8
12 8
123456789 987654321
Output
Case 1:
9 - 8 = 1
 
Case 2:
12 - 8 = 4
 
Case 3:
123456789 - 987654321 = -864197532
Note:
Source:
Author:
ACSolo