demo

using System;
using System.Collections.Generic;
using System.Linq;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> messages = new List<string>();


            while (true)
            {
                string line = Console.ReadLine();
                if (line == "end")
                {
                    break;
                }
                string[] parts = line.Split(" ", StringSplitOptions.RemoveEmptyEntries);
                string command = parts[0];

                if (command == "Chat")
                {
                    messages.Add(parts[1]);
                }
                else if (command == "Delete")
                {
                    if (messages.Contains(parts[1]))
                    {
                        messages.Remove(parts[1]);
                    }
                }
                else if (command == "Edit")
                {
                    string oldMessage = parts[1];
                    string newMessage = parts[2];
                    if (messages.Contains(oldMessage))
                    {
                        int indexOfOldItem = messages.IndexOf(oldMessage);
                        messages[indexOfOldItem] = newMessage;
                    }
                }
                else if (command == "Pin")
                {
                    string searchMessage = parts[1];
                    messages.Remove(searchMessage);
                    messages.Add(searchMessage);
                }
                else if (command == "Spam")
                {

                    for (int i = 1; i < parts.Length; i++)
                    {
                        messages.Add(parts[i]);
                    }
                }
            }
            Console.WriteLine(string.Join(Environment.NewLine, messages));
        }
    }
}