using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    private static List<string> wordsList = new List<string>();

​

    public static void Main()

    {

        string input;

        while ((input = Console.ReadLine()) != "END")

        {

            ProcessCommand(input);

        }

    }

​

    private static void ProcessCommand(string input)

    {

        string[] parts = input.Split(' ');

        string command = parts[0].ToUpper();

​

        switch (command)

        {

            case "ADD":

                AddCommand(parts.Skip(1));

                break;

            case "REMOVE":

                RemoveCommand(parts.Skip(1));

                break;

            case "SEARCH":

                SearchCommand(parts.Skip(1));

                break;

            case "UPDATE":

                UpdateCommand();

                break;

            case "LENGTH":

                LengthCommand(parts.Skip(1));

                break;

            case "INSERT":

                InsertCommand(parts.Skip(1));

                break;

            case "PRINT":

                PrintCommand();

                break;

            default:

                Console.WriteLine("Непозната команда.");

                break;

        }

    }

​

    private static void AddCommand(IEnumerable<string> parameters)

    {

        wordsList.AddRange(parameters);

    }

​

    private static void RemoveCommand(IEnumerable<string> parameters)

    {

        int indexToRemove;

        if (parameters.Any() && int.TryParse(parameters.First(), out indexToRemove) && indexToRemove >= 1 && indexToRemove <= wordsList.Count)

        {

            wordsList.RemoveAt(indexToRemove - 1);

        }

    }

​

    private static void SearchCommand(IEnumerable<string> parameters)

    {

        string wordToSearch = parameters.FirstOrDefault();

        if (!string.IsNullOrEmpty(wordToSearch))

        {

            if (wordsList.Contains(wordToSearch))

            {

                Console.WriteLine("Думата '{wordToSearch}' е намерена.");

            }

            else

            {

                Console.WriteLine("Not contained.");

            }

        }

    }

​

    private static void UpdateCommand()

    {

        for (int i = 0; i < wordsList.Count; i++)

        {

            if (!string.IsNullOrEmpty(wordsList[i]) && char.IsLetter(wordsList[i][0]))

            {

                wordsList[i] = char.ToUpper(wordsList[i][0]) + wordsList[i].Substring(1).ToLower();

            }

        }

    }

​

    private static void LengthCommand(IEnumerable<string> parameters)

    {

        int length;

        if (parameters.Any() && int.TryParse(parameters.First(), out length))

        {

            var filteredWords = wordsList.Where(word => word.Length == length).ToList();

            if (filteredWords.Count > 0)

            {

                Console.WriteLine(string.Join("; ", filteredWords));

            }

            else

            {

                Console.WriteLine("Not contained.");

            }

        }

    }

​

    private static void InsertCommand(IEnumerable<string> parameters)

    {

        int indexToInsert;

        string wordToInsert;

        if (parameters.Count() >= 2 && int.TryParse(parameters.First(), out indexToInsert) && indexToInsert >= 1)

        {

            wordToInsert = parameters.Skip(1).FirstOrDefault();

            if (indexToInsert <= wordsList.Count + 1)

            {

                wordsList.Insert(indexToInsert - 1, wordToInsert);

            }

            else

            {

                Console.WriteLine("There are not enough items in the list.");

            }

        }

    }

​

    private static void PrintCommand()

    {

        Console.WriteLine(string.Join("; ", wordsList) + ";");

    }

}

​