#include <iostream>
#include <string>
using namespace std;
int main() {
	long long a, b, c;
	cin >> a >> b >> c;
	long long i;
	bool buy = false;
	for(int step = 0; step < 10000; ++step) {
		string op;
		cin >> op;
		if(op == "end") break;
		i += 1;
		if(b + c * i <= a * i) {
			if(buy) {
				cout << "self" << endl;
			} else {
				cout << "buy" << endl;
				buy = true;
			}
		} else {
			cout << "airline" << endl;
		}
	}
}