Letters Change Numbers

package com.company;

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String[] inputLine = input.nextLine().split("\\s+");
        double sum = 0;
        for (int i = 0; i < inputLine.length; i++) {
            double tempNum = 0;
            Pattern numPattern = Pattern.compile("-?\\d+");
            Matcher numMatcher = numPattern.matcher(inputLine[i]);
            while (numMatcher.find()) {
                tempNum = Double.parseDouble(numMatcher.group());
            }
            if (Character.isUpperCase(inputLine[i].charAt(0))) {
                tempNum = tempNum / ((int)(inputLine[i].charAt(0)) - 64);
            }
            else {
                tempNum = tempNum * ((int)(inputLine[i].charAt(0)) - 96);
            }
            if (Character.isUpperCase(inputLine[i].charAt(inputLine[i].length()-1))) {
                tempNum = tempNum - ((int)(inputLine[i].charAt(inputLine[i].length()-1)) - 64);
            }
            else {
                tempNum = tempNum + ((int)(inputLine[i].charAt(inputLine[i].length()-1)) - 96);
            }
            sum += tempNum;
        }
        System.out.printf("%.2f", sum);
    }
}