using System;

using System.Text;

public class Program

    {

        public static void Main(string[] args)

        {

            string input = "BG92UBBS80021088489340";

​

            string rearranged = input.Substring(4, input.Length - 4) + input.Substring(0, 4);

​

            StringBuilder sb = new StringBuilder();

            foreach (var @char in rearranged)

            {

                int temp;

                if (char.IsLetter(@char))

                    temp = @char - 55;

                else

                    temp = int.Parse(@char.ToString());

                sb.Append(temp);

            }

​

            string asciiCoded = sb.ToString();

            int checksum = int.Parse(asciiCoded.Substring(0, 1));

            for (var i = 1; i < asciiCoded.Length; i++)

            {

                checksum *= 10;

                checksum += int.Parse(asciiCoded.Substring(i, 1));

                checksum %= 97;

            }

            Console.WriteLine(checksum == 1);

        }

    }