Mid Exam 2

package mid.exam;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.concurrent.atomic.AtomicInteger;

public class Problem2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String input = sc.nextLine();
        String[] arr = input.split(", ");
        int blackisted = 0, lost = 0;

        while(!input.equals("Report")){
            input = sc.nextLine();
            String[] command = input.split(" ");
            switch (command[0]){
                case "Blacklist": {
                    boolean found = false;
                    for (int i = 0; i < arr.length; i++) {
                        if (arr[i].equals(command[1]) && !found){
                            arr[i] = "Blacklisted";
                            System.out.println(command[1] + " was blacklisted.");
                            found = true;
                            blackisted++;
                        }
                    }
                    if(!found){
                        System.out.println(command[1] + " was not found.");
                    }
                    break;
                }
                case "Error": {
                    for (int i = 0; i < arr.length; i++) {
                        if (Integer.parseInt(command[1])==i && !arr[i].equals("Blacklisted") && !arr[i].equals("Lost")){
                            System.out.println(arr[i] + " was lost due to an error.");
                            arr[i] = "Lost";
                            lost++;
                        }
                    }
                    break;
                }
                case "Change":{
                    for (int i = 0; i < arr.length; i++) {
                        if (Integer.parseInt(command[1])==i){
                            System.out.println(arr[i] + " changed his username to " + command[2] + ".");
                            arr[i] = command[2];
                        }
                    }
                    break;
                }
            }
        }

        System.out.println("Blacklisted names: " + blackisted);
        System.out.println("Lost names: " + lost);
        for (String el: arr) {
            System.out.print(el + " ");
        }

    }
}