using System;

public class Program

{

    public static void Main()

    {

        ///Task1

        /*

        string s1 = "life";

        string s2 = "is";

        string s3 = "beautiful";  

        string[] sentence = new string[] {s1, s2, s3}; 

        String s4 = String.Join(" ", sentence);

        string s5 = String.Concat(s4, ", ");

        string s6 = String.Concat(s4, ", ");

        string s7 = String.Concat(s4, " ");

        Console.Write(s5);

        Console.Write(s6);

        Console.WriteLine(s7);

        Console.WriteLine(s4.Length);

        */

        ///Task2

        /*

        string s1 = "snowman";

        char ch1 = s1[0];

        char ch2 = s1[(s1.Length-1)/2];

        char ch3 = s1[s1.Length - 1]; 

        Console.WriteLine(s1);

        Console.WriteLine("first symbol: " + ch1);

        Console.WriteLine("middle symbol: " + ch2);

        Console.WriteLine("last symbol: " + ch3);

        */

        ///Task3

        do

        {

            string s1 = Console.ReadLine();

            if(s1.Length < 5)

                Console.WriteLine("Enter a word with more than 5 symbols");

        }

        while(s1.Length < 5);

    }

}