using System;

public static class Program

{

    public static string FirstLetterUpperCase(this string word)

    {

        char letter = Char.ToUpper(word[0]);

        string remaining = word.Substring(1);

        return letter + remaining;

    }

    public static void Main()

    {

         string word = "football"

                               .FirstLetterUpperCase();

        Console.WriteLine("Word : {0}",word);

        string newWord = FirstLetterUpperCase(word);

        Console.WriteLine("New words : {0}",newWord);

    }

}