Subtraction

An employee at a renowned bank unexpectedly discovered a flaw in some of the bank's operational software: the subtraction of one number from another occasionally yields incorrect results, posing a potential security risk. For instance, a client reported that after withdrawing $125 from an account balance of $296, the account was inexplicably empty, though it should have had $171 remaining.

Your task is to urgently develop a straightforward yet crucial program that accurately performs the subtraction of one number from another, to prevent electronic thieves from exploiting this security vulnerability.

Input

The input file contains two integers, each ranging from -2^63 to 2^63-1.

Output

Output the result of subtracting the second number from the first.

Examples