using System;
using System.Linq;

namespace Friendlist_Maintenance
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] frienlist = Console.ReadLine().Split(", ").ToArray();

            string input = string.Empty;
            int blacklistedCounter = 0;
            int errorsCounter = 0;
            bool checkBlacklist = false;
            bool checkChange = false;

            while ((input = Console.ReadLine()) != "Report")
            {
                string[] tokens = input.Split().ToArray();
                switch (tokens[0])
                {
                    case "Blacklist":
                        for (int i = 0; i < frienlist.Length; i++)
                        {
                            string current = frienlist[i];
                            if (frienlist[i] == tokens[1])
                            {
                                frienlist[i] = "Blacklisted";
                                Console.WriteLine($"{current} was blacklisted.");
                                blacklistedCounter++;
                                checkBlacklist = true;
                                break;
                            }
                        }
                        if (checkBlacklist == false)
                        {
                            string name = tokens[1];
                            Console.WriteLine($"{name} was not found.");
                        }
                        checkBlacklist = false;
                        break;
                    case "Error":
                        errorsCounter++;
                        if ((int.Parse(tokens[1])) >= 0 && (int.Parse(tokens[1])) < frienlist.Length)
                        {
                            if (frienlist[int.Parse(tokens[1])] != "Blacklisted" && frienlist[int.Parse(tokens[1])] != "Lost")
                            {
                                string current = frienlist[(int.Parse(tokens[1]))];
                                frienlist[(int.Parse(tokens[1]))] = "Lost";
                                Console.WriteLine($"{current} was lost due to error.");
                            }
                        }
                        break;
                    case "Change":
                        for (int i = 0; i < frienlist.Length; i++)
                        {
                            string current = frienlist[i];
                            if (tokens[1] == frienlist[i])
                            {
                                frienlist[i] = tokens[2];
                                Console.WriteLine($"{current} changed his username to {tokens[2]}.");
                                checkChange = true;
                                break;
                            }
                        }
                        if (checkChange == false)
                        {
                            string name = tokens[1];
                            Console.WriteLine($"{name} was not found.");
                        }
                        checkChange = false;
                        break;
                }
            }
            Console.WriteLine($"Blacklisted users: {blacklistedCounter}.");
            Console.WriteLine($"Errors occurred: {errorsCounter}.");
            foreach (var name in frienlist)
            {
                if (name != "Blacklisted" && name != "Lost")
                {
                    Console.Write($"{name} ");
                }
            }
        }
    }
}