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;

namespace abc107_a
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] AB = Console.ReadLine().Split(' ');
            int A = Convert.ToInt32(AB[0]);
            int B = Convert.ToInt32(AB[1]);
            int sum = 0;
            for(int i = A; i <= B; i++)
            {
                int dec = 0;
                string iss = Convert.ToString(i);
                for(int n = 0; n < iss.Length / 2; n++)
                {
                    if (iss.Substring(n, 1) != iss.Substring(iss.Length - n - 1, 1))
                    {
                        dec++;
                    }
                }
                if(dec == 0)
                {
                    sum++;
                }
            }
            Console.WriteLine(sum);
            Console.ReadLine();



        }
    }
}