Contact List

import java.util.*;
import java.util.stream.Collectors;

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

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

        while (true) {
            String[] tokens = scanner.nextLine().split(" ");
            String command = tokens[0];
            switch (command) {
                case "Add": {
                    String name = tokens[1];
                    int index = Integer.parseInt(tokens[2]);
                    if (contacts.contains(name)) {
                        if (isValidIndex(contacts, index)) {
                            contacts.add(index, name);
                        }
                    } else {
                        contacts.add(name);
                    }
                    break;
                }
                case "Remove": {
                    int index = Integer.parseInt(tokens[1]);
                    if (isValidIndex(contacts, index)) {
                        contacts.remove(index);
                    }
                    break;
                }
                case "Export": {
                    int index = Integer.parseInt(tokens[1]);
                    int count = Integer.parseInt(tokens[2]);
                    int maxValue = index + count;

                        if (maxValue > contacts.size()) {
                            maxValue = contacts.size();
                        }
                        for (int i = index; i < maxValue; i++) {
                            System.out.print(contacts.get(i) + " ");
                        }
                        System.out.println();
                    break;
                }
                case "Print": {
                    switch (tokens[1]) {
                        case "Normal": {
                            System.out.print("Contacts: ");
                            System.out.println(String.join(" ", contacts));
                            return;
                        }
                        case "Reversed": {
                            Collections.reverse(contacts);
                            System.out.print("Contacts: ");
                            System.out.println(String.join(" ", contacts));
                            return;
                        }
                    }
                    break;
                }
            }
        }
    }

    private static boolean isValidIndex(List<String> contacts, int index) {
        return 0 <= index && index < contacts.size();
    }
}