A. AHB
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard 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 Xi. The operation gives an integer number defined as follows: the i-th digit of is equal to |Ai - Bi|. Calculate the result of !

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 , without leading zeroes.

Examples
Input
123 151
Output
32
Input
11 21
Output
10