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Problem A
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Write a program that computes the difference between non-negative integers.

Input

Each line of the input consists of a pair of integers. Each integer is between 0 and 1015 (inclusive). The input is terminated by end of file.

Output

For each pair of integers in the input, output one line, containing the absolute value of their difference.

Sample Input 1 Sample Output 1
10 12
71293781758123 72784
1 12345677654321
2
71293781685339
12345677654320
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