List Operations

package com.company;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

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


        String line = scanner.nextLine();
        List<Integer> numbers = parsLineOfNumbres(line);

        String command = scanner.nextLine();

        while (!command.equals("End")) {
            String[] token = command.split("\\s+");


            if (token[0].contains("Add")) {
                int element = Integer.parseInt(token[1]);
                int index = numbers.size();
                numbers.add((index), (element));

            } else if (token[0].contains("Remove")) {
                int index = Integer.parseInt(token[1]);
                if (index >= 0 && index <= numbers.size()) {
                    numbers.remove(index);
                } else {
                    System.out.println("Invalid index");
                }
            } else if (token[0].contains("Insert")) {
                int index = Integer.parseInt(token[2]);
                int element = Integer.parseInt(token[1]);
                if (index >= 0 && index <= numbers.size()) {
                    numbers.add((index), element);
                } else {
                    System.out.println("Invalid index");
                }
            } else if (token[1].contains("left")) {
                int count = Integer.parseInt(token[2]);
                for (int i = 0; i < count; i++) {
                    int firstPosition = numbers.get(0);
                    numbers.remove(0);
                    numbers.add(firstPosition);
                }
            } else if (token[1].contains("right")) {
                int count = Integer.parseInt(token[2]);
                for (int i = 0; i < count; i++) {
                    int lastPosition = numbers.get(numbers.size() - 1);
                    numbers.remove(numbers.get(numbers.size() - 1));
                    numbers.add(0, lastPosition);

                }

            }

            command = scanner.nextLine();
        }
        for (int i = 0; i < numbers.size(); i++) {
            System.out.print(numbers.get(i) + " ");

        }

    }

    private static List<Integer> parsLineOfNumbres(String line) {
        String[] strings = line.split(" ");
        List<Integer> numbers = new ArrayList<>();
        for (String string : strings) {
            int number = Integer.parseInt(string);
            numbers.add(number);
        }
        return numbers;
    }
}