8

using System;
using System.Text.RegularExpressions;

namespace ExamPreparation
{
    public sealed class Preparation
    {
        public static void Main()
        {
           string[] tokens = Console.ReadLine().Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
           double totalSum = 0;
            string pattern = @"([a-zA-z])(\d+)([a-zA-Z])";

            foreach (var token in tokens)
            {
                Match match = Regex.Match(token, pattern);
                char letterBefore = match.Groups[1].Value[0];
                double number = double.Parse(match.Groups[2].Value);
                char letterAfter = match.Groups[3].Value[0];

                if (char.IsLower(letterBefore))
                {
                    number *= (letterBefore - 96);
                }
                else
                {
                    number /= (letterBefore - 64);
                }

                if (char.IsLower(letterAfter))
                {
                    number += (letterAfter - 96);
                }
                else
                {
                    number -= (letterAfter - 64);
                }

                totalSum += number;
            }

            Console.WriteLine($"{totalSum:F2}");
        }
    }
}