using System;

public class Program

{

    public static void Main()

    {

        var dt = DateOnly.Parse("Mon. 11/22/2021");

        for(var i = 0; i < 20; i++)

        {

            dt = dt.AddDays(1);

            Console.WriteLine(dt.DayOfWeek.ToString().Substring(0, 3) + ". " + dt);

        }

    }

}