import java.util.Scanner;

/**
 * Created by Atanas on 17/01/2017.
 */
public class p12_SpdScl {
    public static void main(String[] args) {

        Scanner x = new Scanner(System.in);

        double speed = Double.parseDouble(x.nextLine());

        if (speed <= 10) {
            System.out.println("slow");
        } else if (speed > 10 && speed <= 50) {
            System.out.println("average");
        } else if (speed > 50 && speed <= 150){
            System.out.println("fast");
        } else if (speed > 150 && speed <= 1000){
            System.out.println("ultra fast");
        } else if (speed > 1000){
            System.out.println("extremely fast");
        }
    }
}