Background

Description

We have two monkeys, a and b, and the parameters aSmile and bSmile indicate if each is smiling. We are in trouble if they are both smiling or if neither of them is smiling. Return true if we are in trouble.

Format

Input

Output

Samples

true true

true

false false

true

true false

false

Limitation

1s, 1024KiB for each test case.