Background

Special for beginners, ^_^

Description

Given a integer a, print the absolute of a.

Format

Input

A integers a

Output

One integer, the absolute of a.

Sample 1

Input

-123

Output

123

Sample 2

Input

1234567

Output

1234567

Hint

-100000000<=a<=100000000

If a<0,the absolute of a is -a.

If a>0,the absolute of a is a.

If a==0,the absolute of a is zero.

Source

Vijos Original