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 PHP (7.4.4) (judge verdict: Accepted)

<?php
  list($a, $b) = explode(" ", trim(fgets(STDIN)));

  $ans = 0;
  for ($i=$a; $i<=$b; $i++) {
    $j = strrev($i);
    if($j == $i){
      $ans++;
    }
  }

  echo $ans;