#include <bits/stdc++.h>
using namespace std;

int main() {
//  freopen(".in","r",stdin);
//  freopen(".out","w",stdout);
	int a, b, c;
	cin >> a >> b >> c;
	if (a + b <= c || a + c <= b || b + c <= a) {
		cout << "Not triangle";
	} else {
		if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a) {
			cout << "Right triangle\n";
		} else if (a * a + b * b > c * c || a * a + c * c > b * b || b * b + c * c > a * a) {
			cout << "Acute triangle\n";
		} else if (a * a + b * b < c * c || a * a + c * c < b * b || b * b + c * c < a * a) {
			cout << "Obtuse triangle\n";
		}

		if (a == b || b == c || a == c) {
			cout << "Isosceles triangle\n";
		}

		if (a == b && b == c) {
			cout << "Equilateral triangle\n";
		}

	}
	return 0;
}