import java.util.*;

public class Practicer {


	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);

		int[] sides = new int[3];

		for(int i=0;i<3;i++){
			sides[i] = cin.nextInt();
		}

		Arrays.sort(sides);
		double judgeNumber =  (Math.pow(sides[0],2)+Math.pow(sides[1],2)-Math.pow(sides[2],2));

		if(judgeNumber==0){
			System.out.println("right triangle");
		}
		else if(judgeNumber<0){
			System.out.println("obtuse triangle");
		}
		else if(judgeNumber>0){
			System.out.println("acute triangle");
		}
	}
}