using System;

public class Program

{

    public static void Main()

    {

        string a = GetUniqueFileName();

        string b = GetUniqueFileName();

        string c = GetUniqueFileName();

        Console.WriteLine(a);

        Console.WriteLine(b);

        Console.WriteLine(c);

        Console.WriteLine(a == b && b == c);

    }

    private static string GetUniqueFileName() {

        return $"demo-{DateTime.Now.ToFileTimeUtc()}.json";

    }

}