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 OCaml (4.02.3) (judge verdict: Accepted)

let a, b = Scanf.scanf " %d %d" @@ fun a b -> a, b
let f n = let s = string_of_int n in s.[0] = s.[4] && s.[1] = s.[3]
let ans = ref 0
let _ = for i = a to b do if f i then incr ans done; Printf.printf "%d\n" !ans