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 (5.6.30) (judge verdict: Wrong Answer)

<?php
$a = fgets(STDIN);
$b = fgets(STDIN);
$count = 0;
for ($i=$a; $i <= $b ; $i++) {
  // code...
  $i1 = substr($i,0,1);
  $i2 = substr($i,1,1);
  $i3 = substr($i,2,1);
  $i4 = substr($i,3,1);
  $i5 = substr($i,4,1);
  $count = 0;
  if($i1 = $i5 && $i2 = $i4){
    $count++;
  }
}
echo $count,'\n';
 ?>