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");
}
}
}