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

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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
Input 1
373
Input 2
YES

Example 2

Input
Input 3
121
Input 4
NO
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