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Matcom Online Grader
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Print $a-b$.
Input
The first line contains an integer $n$ with the number of queries. The following $n$ lines contain two integers $a$ and $b$.
Output
For each input query output $a-b$.
Sample test(s)
Input
5
10 1
6 8
0 0
100 9
9 100
Output
9
-2
0
91
-91