Santa’s Gifts

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

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

        int n = Integer.parseInt(scanner.nextLine());
        List<Integer> houseNumbers = Arrays.stream(scanner.nextLine()
                .split("\\s+"))
                .map(Integer::parseInt)
                .collect(Collectors.toList());

        int currentNum = 0;
        for (int i = 0; i < n; i++) {
            String input = scanner.nextLine();
            String[] command = input.split("\\s+");

            switch (command[0]) {
                case "Forward":
                    int stepsForward = Integer.parseInt(command[1]);
                    if (currentNum + stepsForward < houseNumbers.size()) {
                        houseNumbers.remove(currentNum + stepsForward);
                        currentNum += stepsForward;
                    }
                    break;
                case "Back":
                    int stepsBack = Integer.parseInt(command[1]);
                    if (currentNum - stepsBack >= 0) {
                        houseNumbers.remove(currentNum - stepsBack);
                        currentNum -= stepsBack;
                    }
                    break;
                case "Gift":
                    if (Integer.parseInt(command[1]) >= 0
                            && Integer.parseInt(command[1]) < houseNumbers.size()) {
                        houseNumbers.add(Integer.parseInt(command[1]), Integer.parseInt(command[2]));
                        currentNum = Integer.parseInt(command[1]);
                    }
                    break;
                case "Swap":
                    int firstIndex = houseNumbers.indexOf(Integer.parseInt(command[1]));
                    int secondIndex = houseNumbers.indexOf(Integer.parseInt(command[2]));
                    int value1 = Integer.parseInt(command[1]);
                    int value2 = Integer.parseInt(command[2]);
                    if (firstIndex != -1 && secondIndex != -1) {
                        houseNumbers.set(firstIndex, value2);
                        houseNumbers.set(secondIndex, value1);
                    }
                    break;
            }
        }
        System.out.println("Position: " + currentNum);
        StringBuilder output = new StringBuilder();
        for (Integer number : houseNumbers) {
            output.append(number).append(", ");
        }
        System.out.print(output.toString().replaceAll(", $", ""));
    }
}