Softuni Party - Set

package com.company;


import java.io.IOException;


import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.*;

public class Main {


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

        String input = scanner.nextLine();

        TreeSet<String> vip = new TreeSet<>();
        TreeSet<String> regular = new TreeSet<>();


        while (!input.equals("PARTY")) {
            for (int i = 0; i < input.length(); i++) {
                char firstChar = input.charAt(0);

                if (Character.isDigit(firstChar)) {
                    vip.add(input);
                } else {
                    regular.add(input);
                }
                break;
            }

            input = scanner.nextLine();


        }
        while (!input.equals("END")) {
            input = scanner.nextLine();
            vip.remove(input);
            regular.remove(input);
        }


        int count = vip.size() + regular.size();
        System.out.println(count);
        for (String guestVip : vip) {
            System.out.println(guestVip);
        }
        for (String guestRegular : regular) {
            System.out.println(guestRegular);
        }


    }
}