Competitions

# Four-digit palindrom

Four-digit number is given. Determine is it a palindrome. A positive integer is a palindrome if it is read the same from left to right and from right to left. For example the number 2332 is palindrome.

#### Input

Onr four-digit number n.

#### Output

Print "YES", if the number n is a palindrome, and "NO" otherwise.

Time limit 1 second
Memory limit 128 MiB
Input example #1
2332

Output example #1
YES

Input example #2
5446

Output example #2
NO