#include<iostream>
using namespace std;
int main()
{
	char a;
	cin>>a;
	if(a=='a'){
		cout<<"apple";
	}
	else if(a=='b'){
		cout<<"banana";
	}
	else if(a=='c'){
		cout<<"cat";
	}
	else{
		cout<<"no";
	}
	return 0;
}