import java.util.*;
class Car{
    String n;
    Car(String n){
        this.n=n;
    }
    void display(){
          System.out.println("Invalid input");
          return;
}
}
class Dog extends Car{
    @Override
    void display(){
        System.out.println("Woof");
        return;
    }
}
class Cat extends Car{
   @Override
    void display(){
        System.out.println("Meow");
        return;
    }
}
class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        Car c1;
        String s=sc.next();
        if(s.equals("Dog")){
            c1=new Dog(s);
            c1.display();
        }
        else if(s.equals("Cat")){
            c1=new Cat(s);
            c1.display();
        }
        else{
          c1=new Car(s);
            c1.display();
        }
    }
}