#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 || a * a + c * c == b * b || b * b + c * c == a * a)
            cout << "Right triangle" << endl;
        else if (a * a + b * b > c * c || a * a + c * c > b * b || b * b + c * c > a * a)
            cout << "Acute triangle" << endl;
        else if (a * a + b * b < c * c || a * a + c * c < b * b || b * b + c * c < a * a)
            cout << "Obtuse triangle" << endl;
        if (a == b || a == c) cout << "Isosceles triangle" << endl;
        if (a == b && b == c) cout << "Equilateral triangle" << endl;
    }
    else cout << "Not triangle" << endl;
    return 0;
}