using System;

namespace class_animal
{
    class Program
    {
        static void Main(string[] args)
        {

            string animal = Console.ReadLine();
            switch (animal)
            {
                case "dog":

                        Console.WriteLine("mammal");

                    break;

                case "snake":
                case "crocodile":
                case "tourtoise":
                Console.WriteLine("reptile");

                    break;

                     default: Console.WriteLine("unknown");
                        break;

            }



        }
    }
}