import java.util.Scanner;
public class AnimalType {
    public static void main(String[] args) {
        Scanner sc =new Scanner(System.in);
        String animal = sc.nextLine();
        switch (animal){
            case dog:
                System.out.println("mammal");
            break;
            case crocodile:
            case tortoise:
            case snake:
                System.out.println("reptile");
                break;
            default:
                System.out.println("unknown");
        }
    }
}