using System;

public class Program

{

    public static void Main()

    {   

        //An isogram is a word or set of words that don't contain the same letter twice, regardless of capitolization.

        //For each of the provided inputs, the desired result is provided. If the word or phrase is an isogram, return true. Else return false.

        Console.WriteLine(CheckForIsogram("test")); //False

        Console.WriteLine(CheckForIsogram("uncopyrightable"));//true

        Console.WriteLine(CheckForIsogram("abcdefghijklmnopqrstuvwxyz")); //True

        Console.WriteLine(CheckForIsogram("This is a sentence.")); //False

        Console.WriteLine(CheckForIsogram("Boo")); //False

        Console.WriteLine(CheckForIsogram("Abc")); //True

        Console.WriteLine(CheckForIsogram("An artichoke")); //False

    }

    public static bool CheckForIsogram(string word)

    {

​

        return true;

    }

}