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

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    if (a + b < c || a + c < b || b + c < a) {
        cout << "Not triangle" << endl;
    } else {
        if (a * a + b * b == c * c || a * a + c * c == b * b || c * c + b * b == a * a) {
            cout << "Right triangle" << endl;
        }
        if (a * a + b * b > c * c || a * a + c * c > b * b || b * b + c * c > a * a) {
            cout << "Acute triangle" << endl;
        }
        if (a * a + b * b < c * c || a * a + c * c < b * b || c * c + b * b < a * a) {
            cout << "Obtuse triangle" << endl;
        }
        if (a == b || a == c || b == c) {
            cout << "Isosceles triangle" << endl;
        }
        if (a == b == c) {
            cout << "Equilateral triangle" << endl;
        }
    }
    return 0;
}