#include<iostream>
#include<string>
#include<algorithm>

using namespace std;

class Animal{
    public:
    virtual void makeSound()=0;
};

class Lion:public Animal{public:
void makesound(){cout<<"Roar";}};
class Dog:public Animal{public:
void makesound(){cout<<"Bark";}};
class Cow:public Animal{public:
void makesound(){cout<<"Moo";}};

int main(){
    string in;
    cin>>in;
    for(char&c:in)c=tolower(c);
    
    Animal*a=nullptr;
    if(in=="lion")a=new Lion();
    else if(in=="Dog")a=new Dog();
    else if(in=="Cow")a=new Cow();
    else{cout<<"Invalid input";return 0;}
    a->makeSound();
    return 0;
}