#include <iostream>
using namespace std;
  
int main()
{ 
    char a;
    int n;
    cin>>a;
    n=int(a);
    if (n==97){cout<<"apple";}
    else if (n==98){cout<<"banana";}
    else if (n==99){cout<<"cat";}
    else {cout<<"no";}
    return 0;
}