String java

import java.util.Scanner;

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

        while (!input.equals("Finish")) {
            String command = input.split(" ")[0];
            switch (command) {
                case "Replace":
                    String ToReplace = input.split(" ")[1];
                    String ReplaceWith = input.split(" ")[2];
                    string = string.replaceAll(ToReplace, ReplaceWith);
                    System.out.println(string);
                    break;
                case "Cut":

                    int Start = Integer.parseInt(input.split(" ")[1]);
                    int End = Integer.parseInt(input.split(" ")[2]);
                    if (Start < 0 || End > string.length()) {
                        System.out.println("Invalid indices!");
                        break;
                    }
                    StringBuilder buffer = new StringBuilder(string);
                    buffer.replace(Start, End, "");
                    string = buffer.toString();
                    System.out.println(string);
                    break;
                case "Make":
                    String Case = input.split(" ")[1];
                    if (Case.equals("Upper")) {
                        string = string.toUpperCase();
                        System.out.println(string);
                        break;
                    }
                    if (Case.equals("Lower")) {
                        string = string.toLowerCase();
                    }
                    System.out.println(string);
                    break;
                case "Check": {
                    String Check = input.split(" ")[1];
                    if (string.contains(Check)) {
                        System.out.println("Message contains " + Check);
                        break;
                    }
                    System.out.println("Message doesn't contain " + Check);

                }
                break;
                case "Sum": {
                    int sum = 0;
                    int start1 = Integer.parseInt(input.split(" ")[1]);
                    int end1 = Integer.parseInt(input.split(" ")[2]);
                    String substring = "";
                    if (start1 < 0 || end1 > string.length()) {
                        System.out.println("Invalid indices!");
                        break;
                    }
                    substring = string.substring(start1, end1 + 1);
                    for (int i = 0; i < substring.length(); i++) {
                        char ch = substring.charAt(i);
                      sum += (int)ch;
//                        int sum += (int)substring[i];
                    }
                    System.out.println(sum);

                }
                break;
            }
            input = scanner.nextLine();
        }
    }

}