LettersChangeNumbers

import java.util.Scanner;

public class LettersChangeNumbers {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String[] nums = sc.nextLine().replaceAll("\\s+", " ").split(" ");
		double totalSum = 0;
		for(int i = 0; i < nums.length; i++) {
			String str = nums[i].replaceAll("[^-?0-9]+", "");
			double num = Double.parseDouble(str);
			if(isUpperCase(nums[i].charAt(0))) {
				num /= getValue(nums[i].charAt(0));
			} else {
				num *= getValue(nums[i].charAt(0));
			}
			if(isUpperCase(nums[i].charAt(nums[i].length() - 1))) {
				num -= getValue(nums[i].charAt(nums[i].length() - 1));
			} else {
				num += getValue(nums[i].charAt(nums[i].length() - 1));
			}
			totalSum += num;
		}
		System.out.printf("%.2f", totalSum);
	}
	public static boolean isLowerCase(char ch) {
		return ch >= 'a' && ch <= 'z';
	}

	public static boolean isUpperCase(char ch) {
		return ch >= 'A' && ch <= 'Z';
	}

	public static int getValue(char c) {
		int value = (int)c;

                if (isUpperCase(c)) {
                        value -= 64;
                }
                if (isLowerCase(c)) {
                        value -= 96;
                }
        return value;

	}
}