_02_LettersChangeNumbers

import java.util.Scanner;

public class _02_LettersChangeNumbers {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String[] inputLine = input.nextLine().split("\\s+");

        Double sum = 0.0;

        for (int i = 0; i < inputLine.length; i++) {
            Double resNumber = 0.0;
            // get the number
            int number = Integer.parseInt(inputLine[i].substring(1, inputLine[i].length()-1));

            // the letter before the number;
            char firstLetter= inputLine[i].charAt(0);

            // get the last letter;
            char lastLetter= inputLine[i].charAt(inputLine[i].length()-1);

            // First letter is a Capital
            if (firstLetter < 96) {
                resNumber = (double)number / ((int)firstLetter - 64);

                // last letter is a capital
                if (lastLetter < 96) {
                    resNumber = resNumber -((int)lastLetter - 64);
                } else {
                    resNumber = resNumber + ((int)lastLetter - 96);
                }
            } else {
                resNumber = (double)number * ((int)firstLetter - 96);
                // last letter is a capital
                if (lastLetter < 96) {
                    resNumber = resNumber - ((int)lastLetter - 64);
                } else {
                    resNumber = resNumber + ((int)lastLetter - 96);
                }
            }
            sum += resNumber;
        }
        System.out.printf("%.2f", sum);
    }
}