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

Each line of the input consists of a pair of integers. Each integer is between $0$ and $10^{15}$ (inclusive). The input is terminated by end of file.

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 |