LettersChangeNumbers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class LettersChangeNumbers
{
    static void Main()
    {
        char[] delimeters = {' ', '\t' };
        string[] input = Console.ReadLine().Split(delimeters,StringSplitOptions.RemoveEmptyEntries);
        double result = 0;

        for (int i = 0; i < input.Length; i++)
        {
            string current = input[i];
            char leftLetter = current[0];
            char rightLetter = current[current.Length - 1];
            int number = int.Parse(current.Substring(1, current.Length - 2));
            double currentResult = number;
            // check left letter
            if (leftLetter >= 'A' && leftLetter <= 'Z')
            {
                currentResult /= ((double)leftLetter - 'A' + 1);
            }
            else
            {
                currentResult *= ((double)leftLetter - 'a' + 1);
            }

            // check right letter
            if (rightLetter >= 'A' && rightLetter <= 'Z')
            {
                currentResult -= ((double)rightLetter - 'A' + 1);
            }
            else
            {
                currentResult += ((double)rightLetter - 'a' + 1);
            }
            result += currentResult;
        }

        Console.WriteLine("{0:F2}", result);
    }
}