#include <iostream>
#include<iomanip>
using namespace std;
int main()
{
	int a, b, c, max;
	cin >> a >> b >> c;

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