401 - Diffy Again

Diffy Again

Time Limit: 1 sec


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The Problem

Make a simple program that reads two variables named A, B. Calculate and print the difference of A and B (A - B).


The Input

Input file consist of several test cases. Each test case contains a line and each line will contains two integers A and B (0<A, B<10000 and A>B). Input is terminated by EOF.


The Output

For each test case you should output a line. This line contains the value of the difference of A and B.


Sample Input

13 5

10 5

12 2


Sample Output








Problem Setter: Shahin ShamS