Problem:
Score : 200 points

Problem Statement

Find the number of palindromic numbers among the integers between A and B (inclusive).
Here, a palindromic number is a positive integer whose string representation in base 10 (without leading zeros) reads the same forward and backward.

Constraints

10000 \leq A \leq B \leq 99999

All input values are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the number of palindromic numbers among the integers between A and B (inclusive).

Sample Input 1

11009 11332

Sample Output 1

4

There are four integers that satisfy the conditions: 11011, 11111, 11211 and 11311.

Sample Input 2

31415 92653

Sample Output 2

612

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php
// $time_s = microtime(true);

fscanf(STDIN, "%d %d", $A, $B);

$ans = 0;
for ($i = $A; $i <= $B; $i++) {
    if (isPand($i)) {
        $ans++;
    }
}
echo $ans . "\n";

// $time_g = microtime(true);

// echo $time_g - $time_s . "\n";

function isPand($num) {
    $arr = str_split(strval($num));
    return (($arr[0] == $arr[4]) && ($arr[1] === $arr[3]));
}