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
  
$ab = explode(' ',trim(fgets(STDIN)));
$a = $ab[0];
$b = $ab[1];

$c = 0;
for($i=$a; $i<=$b; $i++){
  
  $n = $i;
  $n = strval($n);
  
  $nr = [];  
  for($j=0; $j<strlen($n); $j++){
    $nr[$j]=$n[$j]; 
  }
  $nr = array_reverse($nr);
  $nr = implode('',$nr);
  
  if ($n == $nr) $c++;
}

echo $c;

?>