Mid Exam : Last Stop

package com.company;

import javax.print.DocFlavor;
import java.util.*;
import java.util.stream.Collectors;

public class Main {

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


        List<String> numbers = Arrays.stream(scanner.nextLine().split(" "))
                .collect(Collectors.toList());




        //List<String> commands = Arrays.stream(scanner.nextLine().split(" "))
        // .collect(Collectors.toList());
        String inputCommand=scanner.nextLine();

        String second = "";
        String first = "";
        System.out.println();

        while (!inputCommand.equals("END")) {

            List<String> commands = Arrays.stream(inputCommand.split("\\s+"))
                    .collect(Collectors.toList());


            if (commands.size() >= 2){
                first = commands.get(1);
            }
            if (commands.size() == 3){
                second = commands.get(2);

            }
            int index = numbers.indexOf(first);

            if (commands.contains("Change")) {
                if (numbers.contains(first)){
                    numbers.set(index,second);
                }
            }

            if (commands.contains("Hide")) {
                if (numbers.contains(first)) {
                    numbers.remove(index);
                }
            }

            if (commands.contains("Switch")) {
                if (numbers.contains(first) && numbers.contains(second)) {
                    String safe = first;
                    String safe2 = second;
                    numbers.set(numbers.indexOf(second),safe);
                    numbers.set(index,safe2);

                }
            }

            if (commands.contains("Insert")) {
                int firstInt = Integer.parseInt(first);
                if (firstInt <= numbers.size()){
                    numbers.add(firstInt+1,second);
                }

            }

            if (commands.contains("Reverse")) {
                Collections.reverse(numbers);

            }
            inputCommand=scanner.nextLine();
        }


        System.out.println(numbers.toString()
                .replace(",","")
                .replace("[","")
                .replace("]","")
        );

    }
}