07. Letters Change Numbers

import java.util.Scanner;

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

        String[] strings = input.nextLine().split("[ ]+");
        double sum = 0.0;

        for (int i = 0; i < strings.length; i++) {
            sum += CalculateString(strings[i].trim());
        }
        System.out.printf("%.2f", sum);
    }

    private static double CalculateString(String string) {
        char c1 = '\0';
        char c2 = '\0';
        double sum = 0.0;
        String num = "";
        try {
            c1 = string.charAt(0);
            c2 = string.charAt(string.length() - 1);
            num = string.substring(1, string.length() - 1);
        }catch (Exception ex){

        }
        double number = Double.parseDouble(num);

        int possition = 0;

        if (Character.isUpperCase(c1)) {
            possition = c1 - 64;
            sum += (number / possition);
        } else {
            possition = c1 - 96;
            sum += (number * possition);
        }
        if (Character.isUpperCase(c2)) {
            possition = c2 - 64;
            sum -= possition;
        } else {
            possition = c2 - 96;
            sum += possition;
        }

        return sum;
    }
}