The Final Quest

package com.company;


import java.util.ArrayList;
import java.util.Collections;
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().split(" +");
        List<String> words = new ArrayList<>();
        for (int i = 0; i < line.length; i++) {
            words.add(line[i]);

        }
        String command = scanner.nextLine();
        while (!command.equals("Stop")) {
            String[] tokens = command.split(" +");
            String instruction = tokens[0];

            if (instruction.equals("Swap")) {
                String firstWord = tokens[1];
                int firstIndex = words.indexOf(firstWord);
                String secondWord = tokens[2];
                int secondIndex = words.indexOf(secondWord);
                if (firstIndex >= 0 && firstIndex < words.size()) {
                    if (secondIndex >= 0 && secondIndex < words.size()) {
                        Collections.swap(words, firstIndex, secondIndex);
                    }
                }


            } else if (instruction.equals("Replace")) {
                String word1 = tokens[1];
                String word2 = tokens[2];
                int index2 = words.indexOf(word2);
                if (index2 >= 0 && index2 < words.size()) {
                    words.set(index2, word1);
                }

            } else if (instruction.equals("Delete")) {
                int index = Integer.valueOf(tokens[1]);
                int indexToRemove = index + 1;

                if (indexToRemove >= 0 && indexToRemove < words.size()) {
                    String wordToremove = words.get(indexToRemove);
                    words.remove(wordToremove);
                }

            } else if (instruction.equals("Put")) {
                String wordToAdd = tokens[1];
                int indexToUse = Integer.parseInt(tokens[2]) - 1;

                if (indexToUse == words.size()) {
                    words.add(wordToAdd);
                } else if (indexToUse >= 0 && indexToUse < words.size()) {

                    words.add(indexToUse, wordToAdd);

                }

            } else if (instruction.equals("Sort")) {//descending order
                Collections.sort(words);
                Collections.reverse(words);
            }


            command = scanner.nextLine();
        }
        for (String word : words) {
            System.out.print(word + " ");
        }


    }
}