#include <stdio.h>
#include <iostream>
using namespace std;
int main(){
	int a,b,c;
	cin >> a >> b >> c;
	if ( a + b > c && a + c > b && b + c > a){
		if (a * a + b * b == c * c){
			cout << "Right triangle\n";
		}
		else if (a * a + b * b > c * c){
			cout << "Acute triangle\n";
		}
		else if (a * a + b * b < c * c){
			cout << "Obtuse triangle\n";
		}
		if (a == b || a == c || b == c){
			cout << "Isosceles triangle\n";
		}
		if (a == b && b== c){
			cout << "Equilateral triangle\n";
		}
	return 0;
	}
	cout << "Not triangle\n";
	return 0;
}