JF-TextProcessing-Exercise-08.LettersChangeNumbers

package com.company;

import java.util.Scanner;

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

        String[] strings = sc.nextLine().split("\\s+");

        double sum = 0.0;

        for (String string : strings) {
            char before = string.charAt(0);
            char after = string.charAt(string.length() - 1);

            long number = Long.parseLong(string.substring(1, string.length() - 1));

            sum += calcCurrentValue(before, after, number);

        }
        System.out.printf("%.2f", sum);
    }

    private static double calcCurrentValue(char before, char after, long number) {
        double value = 0;
        if (Character.isUpperCase(before)) {
            value += number * 1.0 / (before - 'A' + 1);
        } else {
            value += number * (before - 'a' + 1);
        }
        if (Character.isUpperCase(after)) {
            value -= (after - 'A' + 1);
        } else {
            value += (after - 'a' + 1);
        }
        return value;
    }
}