Competitions

# Week 2: November 16 – 22. Conditional statement. Part 2

# 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.

Input example #1

2332

Output example #1

YES

Input example #2

5446

Output example #2

NO