import java.util.Scanner;

public class NickyEnMark {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int a = scanner.nextInt();
		int b = scanner.nextInt();
		int c = scanner.nextInt();
		int d;
		if (a == c) {
			d = 0;
		} else {
			d = b / (a - c);
		}

		boolean bought = false;

		while (true) {
			String s = scanner.next();
			if (s.equals("end")) {
				break;
			}

			if (d > 0 || c >= a) {
				System.out.println("airline");
				d--;
			} else if (!bought) {
				System.out.println("buy");
				bought = true;
			} else {
				System.out.println("self");
			}
		}
	}
}