Problem Description

Given an integer $N$, reverse its digits to obtain a new number. The new number should also follow the usual form of integers: unless the original number is zero, the leading digit of the reversed number must not be zero (see Sample 2).

Input Format

A single integer N.

Output Format

A single integer, which is the reversed number.

123

321

-380

-83

Hint

【Constraints】

$-1,000,000,000\leq N\leq 1,000,000,000$.

NOIP 2011 Junior Problem 1.

Translated by ChatGPT 5