02.09.02.01.DurankulakNumber

using System;
using System.Collections.Generic;

class DurankulakNumbers
{
    static List<char> Reverse(string input)
    {
        List<char> revInput = new List<char>();

        for (int i = input.Length - 1; i >= 0; i--)
        {
            revInput.Add(input[i]);
        }
        return revInput;
    }

    static long Convert(List<char> revInput, long numSystem)
    {
        long counterTwo = 1;
        long counter = -1;
        List<long> numbersList = new List<long>();
        long temp = 0;
        long numb = 0;
        bool sign = false;
        for (int i = 0; i < revInput.Count; i++)
        {
            if ((long)revInput[i] >= 97 && (long)revInput[i] <= 102)
            {
                temp = temp + (26 * (revInput[i] - 96));
                counterTwo++;
            }
            if (sign == false)
            {
                numb = numb + temp * (long)Math.Pow(numSystem, counter);
                sign = true;
            }
            if ((long)revInput[i] >= 65 && (long)revInput[i] <= 90)
            {
                temp = ((long)revInput[i] - 65);
                counter++;
                sign = false;
            }
        }
        if (sign == false)
        {
            numb = numb + temp * (long)Math.Pow(numSystem, counter);
        }
        return numb;
    }

    static void Main()
    {
        string input = (Console.ReadLine());
        long numSystem = 168;
        List<char> revInput = Reverse(input);
        long output = Convert(revInput, numSystem);
        Console.WriteLine(output);
    }
}