Description

Read a string of characters and determine whether it is a palindrome.A "palindrome" is a string that reads the same forwards and backwards, such as "level" or "noon".

Input Format

A single line of string with a length not exceeding 255.

Output Format

If the string is a palindrome, output "YES"; otherwise, output "NO". (Both in uppercase)

```input1 12321 ``` ```output1 YES ``` ## Source

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