NakovFreakShow

using System;
using System.Linq;

class LettersChangeNumbers
{
    static void Main()
    {
        string[] input = Console.ReadLine().Split(new string[] { " ", "\n", "\t" }, StringSplitOptions.RemoveEmptyEntries).ToArray();
        decimal sum = 0;

        for (int i = 0; i < input.Length; i++)
        {
            string arrElement = input[i].ToString();

            char firstLetter = arrElement[0];
            char lastLetter = arrElement[arrElement.Length - 1];

            decimal number =
                decimal.Parse(arrElement.Substring(1, arrElement.Length - 2));

            decimal firstUpper = firstLetter - 64;
            decimal firstLower = firstLetter - 96;

            decimal lastUpper = lastLetter - 64;
            decimal lastLower = lastLetter - 96;

            if (65 <= firstLetter && firstLetter <= 90)
            {
                number /= firstUpper;
            }
            else
            {
                number *= firstLower;
            }

            if (65 <= lastLetter && lastLetter <= 90)
            {
                number -= lastUpper;
            }
            else
            {
                number += lastLower;
            }

            sum += number;
        }

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