Problem:
Score : 100 points

Problem Statement

You are given a three-digit positive integer N.

Determine whether N is a palindromic number.

Here, a palindromic number is an integer that reads the same backward as forward in decimal notation.

Constraints

100≤N≤999

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If N is a palindromic number, print Yes; otherwise, print No.

Sample Input 1

575

Sample Output 1

Yes

N=575 is also 575 when read backward, so it is a palindromic number. You should print Yes.

Sample Input 2

123

Sample Output 2

No

N=123 becomes 321 when read backward, so it is not a palindromic number. You should print No.

Sample Input 3

812

Sample Output 3

No

Solution in PHP (5.6.30) (judge verdict: Accepted)

<?php
error_reporting(0);
//list($H,$W) = explode(" ",trim(fgets(STDIN)));
$N = trim(fgets(STDIN));
//$a = explode(" ",trim(fgets(STDIN)));

$len = strlen($N);
if (($N % 2)==0) {
  printf("No\n");
  exit;
}
for($i=0;$i<floor($len/2);$i++) {
  if ($N[$i]!=$N[$len-$i-1]) {
    printf("No\n");
    exit;
  }
}
printf("Yes\n");