P402507 - GYM100796 A AHB - SSOJ - 省实信息奥赛评测系统

Memory Limit：256 MB Time Limit：1 S

Judge Style：Text Compare Creator：

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A. AHBtime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard output

A and B are two non-negative integer numbers that both consist of n digits. Let the i-th digit of a number X be X_i. The operation $\text{[math]}$ gives an integer number defined as follows: the i-th digit of $\text{[math]}$ is equal to |A_i - B_i|. Calculate the result of $\text{[math]}$ !

Input

The only line of the input contains two space-separated integers A, B (0 ≤ A, B ≤ 10⁹). It is guaranteed that A and B have an equal number of digits.

Output

Output a single integer — the result of $\text{[math]}$ , without leading zeroes.

ExamplesInput

123 151

Output

Input

11 21

Output

402507: GYM100796 A AHB

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