using System;

public class Program

{

    public static void Main()

    {

        string animal = Console.ReadLine();

        switch (animal)

​

{

​

        case "dog":

​

        Console.WriteLine("mammal"); break;

​

        case "crocodile":

​

        case "tortoise":

​

        case "snake":

​

        Console.WriteLine("reptile"); break;

​

        default:

​

        Console.WriteLine("unknown"); break;

​

}

    }

}