BeerTime

using System;
using System.Globalization;

namespace Problem10
{
    class Program
    {
        static void Main(string[] args)
        {
            string dateString = Console.ReadLine();
            string format = "h:mm tt";
            DateTime dateTime;

            if (DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
            {
                string partOfDay = dateTime.ToString("tt", CultureInfo.InvariantCulture);
                if ((partOfDay == "PM" && dateTime.Hour > 1) || (partOfDay == "AM" && dateTime.Hour<3))
                {
                    Console.WriteLine("beer time");
                }
                else
                {
                    Console.WriteLine("non-beer time");
                }
            }
            else
            {
                Console.WriteLine("invalid time");
            }
        }
    }
}