I can't tell you what it really is, I can only tell you what it feels like - Monash Algorithms and Problem Solving Team

I can't tell you what it really is, I can only tell you what it feels like

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Points: 100

Time limit: 1.0s

Memory limit: 256M

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Problem type

Find out if the given string is palindrome!

Input

The only line of the input contains a string of digits. The length of the string is between 1 and 10, inclusive.

Output

Print "YES" or "NO".

Example 1

Input

YES

Example 2

Input

NO

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