LetterChangeNumbers-StringAndRegex

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Text;

public class Program
{
	public static void Main()
	{
		string[] input = Console.ReadLine().Split(new [] {' ','\t'},StringSplitOptions.RemoveEmptyEntries);

		decimal result =0;

		foreach (string entry in input)
		{
			char firstLetter = entry[0];
			char lastLetter = entry[entry.Length-1];

			int len = entry.Length-2;
			string numAsString = entry.Substring(1,len);
			decimal num = decimal.Parse(numAsString);

			if (char.IsUpper(firstLetter))
			{
				int position = (int) firstLetter - 64;

				result += num / position;

			}
			else if (char.IsLower(firstLetter))
			{
				int position = (int) firstLetter - 96;

				result += num*position;

			}

			if (char.IsUpper(lastLetter))
			{
				int position = (int) lastLetter -64;

				result -= position;

			}
			else if (char.IsLower(lastLetter))
			{
				int position = (int) lastLetter-96;

				result += position;

			}
		}

		Console.WriteLine("{0:f2}",result);
	}
}