Samuel's Palindrome

Everyone please welcome Samuel M to MAPS. He loves to paint!

Input

The first line contains a single integer $n$.

Output

Output YES if the number $n$ is palindrome, otherwise print NO.

Constraints

$1 \le n \le 10^9$

Example 1

Input

5

YES

Example 2

Input

6

NO

Example 3

Input

19

YES

Example 4

Input

121

NO