using System;

public class Program

{

    public static void Main()

    {

        String word = "programming";

​

        String subWord = word.Substring(3,3);

        Console.WriteLine(subWord);

​

        char letter = word[2];

        Console.WriteLine(letter);

​

        String upperCaseWord = word.ToUpper();

        Console.WriteLine(upperCaseWord);

​

        int word_length = word.Length;

        Console.WriteLine(word_length);

        if (word.Length > 5) {

            Console.WriteLine("The word is longer than 5 letters");

        }

        else {

            Console.WriteLine("The word is not longer than 5 letters");

        }

        char lastLetter = word[word.Length - 1];

        Console.WriteLine($"The last letter of the string is {lastLetter}");

    }

}