View difference between Paste ID: kLn9gyNk and FLFDFsSm

 import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
 public class ListListManipulationBasics {
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
 
         String[] input = scanner.nextLine().split("\\s+");
         List<Integer> numbers = new ArrayList<>();
         for (int i = 0; i < input.length; i++) {
             numbers.add(Integer.parseInt(input[i]));
         }
 
         String inputLine = scanner.nextLine();
 
         while (!"end".equals(inputLine)) {
             String[] tokens = inputLine.split("\\s+");
 
             switch (tokens[0]) {
                 case "Add":
                     int numberToAdd = Integer.parseInt(tokens[1]);
                     numbers.add(numberToAdd);
                     break;
                 case "Remove":
                     int numberToRemove = Integer.parseInt(tokens[1]);
                     numbers.remove((Object)numberToRemove);
                     break;
                 case "RemoveAt":
                     int indexToRemove = Integer.parseInt(tokens[1]);
                     numbers.remove(indexToRemove);
                     break;
                 case "Insert":
                     int numberToInsert = Integer.parseInt(tokens[1]);
                     int atGivenIndex = Integer.parseInt(tokens[2]);
                     numbers.add(atGivenIndex, numberToInsert);
                     break;
 
             }
 
 
             inputLine = scanner.nextLine();
         }
 
         System.out.println(numbers.toString().replaceAll("[\\[\\],]", ""));
     }
 }