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12 hour clock subtraction
     

Given two positive integers num1 and num2, subtract num2 from num1 on a 12 hour clock rather than a number line.

Input:
First line of the input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case consists of a single line containing two integers separated by a space .

 

Output:
Corresponding to each test case, print the difference in a new line.


Constraints:
1<=T<=100
0<=num1<=1000
0<=num2<=1000
 
Example:

Input
2
7 5
5 7

Output
2

-2

 

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Aditya Garg

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