High Precision Subtraction

Given two huge integers A and B, compute their difference (A - B). These integers can be extremely large such that typical data types are insufficient. Use high precision arithmetic to calculate the result.

inputFormat

The input consists of a single line containing two space-separated integers (A) and (B). (A) and (B) are non-negative integers in string format which can be very large.

outputFormat

Output a single integer, the result of (A - B). Note that the result may be negative if (A < B).

sample

123456789123456789 987654321

123455801469135468