Description

Calculate the difference between two large positive integers.

Input Format

Two lines: the first line contains the minuend $a$, and the second line contains the subtrahend $b$ ($a > b$). Each large integer is at most $200$ digits long and has no leading zeros.

Output Format

A single line containing the difference.

Sample

9999999999999999999999999999999999999
9999999999999

9999999999999999999999990000000000000