View difference between Paste ID: 3NHjychX and axpFkM3a

 import java.math.BigInteger;
 import java.util.Scanner;
 
 public class Demo {
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
         String input = scanner.nextLine(); //"P34562Z q2576f   H456z"
         String [] passwords = input.split("\\s+"); //["P34562Z", "q2576f", "H456z"]
         double totalSum = 0; //обща сума от всички пароли
         for (String password : passwords) {
             //пресмятаме стойността
             double modifiedNumber = getModifiedNumber(password);
             //сумираме
             totalSum += modifiedNumber;
         }
 
         System.out.printf("%.2f", totalSum);
 
     }
 
         private static double getModifiedNumber (String password) {
         //{буква}{число}{буква} -> "P34562Z"
         char firstLetter = password.charAt(0); //"P"
         char secondLetter = password.charAt(password.length() - 1);
         //първи начин: int number = Integer.parseInt(password.replace(firstLetter, ' ').replace(secondLetter, ' ').trim());
         //втори начин:
         StringBuilder builder = new StringBuilder(password);
         double number = Double.parseDouble(builder.deleteCharAt(0).deleteCharAt(builder.length() - 1).toString());
         //трети начин: int number = Integer.parseInt(password.substring(1, password.indexOf(secondLetter)));
 
         //проверка за първата буква
         if (Character.isUpperCase(firstLetter)) { //аски кода >= 65 и <= 90
             //позиция в азбуката
             int positionUpperLetter = (int)firstLetter - 64;
             number = number / positionUpperLetter;
         } else {
             int positionLowerLetter = (int)firstLetter - 96;
             number = number * positionLowerLetter;
         }
 
         //проверка за втората буква
         if(Character.isUpperCase(secondLetter)) {
             int positionUpperLetter = (int)secondLetter - 64;
             number = number - positionUpperLetter;
         } else {
             int positionLowerLetter = (int)secondLetter - 96;
             number = number + positionLowerLetter;
         }
 
         return number;
     }
 }