#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,num;
	cin >> a >> b >> c;
	if (a < b){
		num = a;
		a = b;
		b = num;
	}
	if (a < c){
		num = a;
		a = c;
		c = num;
	}
	if (b < c){
		num = b;
		b = c;
		c = num;
	}
	
	if (b * b + c * c == a * a){
		cout << "Right triangle";
	}else if (b * b + c * c > a * a){
		cout << "Acute triangle";
	}else if (b * b + c * c < a * a){
		cout << "Obtuse triangle";
	}else if (b == c){
		cout << "Isosceles triangle";
	}else if (a == b == c){
		cout << "Equilateral triangle";
	}else{
		cout << "Not triangle";
	}
	return 0;
}