#include<iostream>
using namespace std;

int main()
{
  char n;
	cin>>n;
	switch(n)
	{
		case 'a':
			cout<<"apple"<<endl;
			break;
		case 'b':
			cout<<"banana"<<endl;
			break;
		case 'c':
			cout<<"cat"<<endl;
			break;
		case 'y':
			cout<<"yzx_28 nb!"<<endl;
			break;
		default :
			cout<<"no"<<endl;
	 } 

  return 0;
}