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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;

namespace ProgramingStydying
{
    class Program
    {
        static void Main(string[] args)
        {
            var ab = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var a = ab[0];
            var b = ab[1];
            var ans = 0;

            for(int M = a; M <= b; M++)
            {
                var m = M;
                var n = 0;
                for(int i = 0; i < 5 ; i++)
                {
                    n += (m % 10) * (int)Math.Pow(10, 4 - i);
                    m /= 10;
                }

                if(n == M)
                {
                    ans++;
                }
            }
            Console.WriteLine(ans);
        }
    }
}