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 PHP7 (7.0.15) (judge verdict: Runtime Error)

<?php

// 台数
fscanf(STDIN, "%d", $n);

for ($i = 0; $i < $n; $i++) {
	fscanf(STDIN, "%d", $t);
	if ($i === 0) {
		$max = $t;
		continue;
	}

	$max = saisyou_koubaisuu($t, $max);
}

echo (int)$max;


function saisyou_koubaisuu($a, $b)
{
	return $a * $b / saidai_kouyakusuu($a, $b);
}

function saidai_kouyakusuu($a, $b)
{
	if ($b === 0) {
		return $a;
	}
	return saidai_kouyakusuu($b, $a % $b);
}

?>