#include <iostream>
using namespace std;
int main()
{
	int a,b,c;
	cin >> a >> b>>c;
	if (a + b < c)
	{
		cout << "Not triangle"<<endl;
	}
	 if (a == b && b == c)
	{
		cout << "Isosceles triangle"<<endl;
	}
	 if (a == b || a == c || b == c)
	{
		cout << "Equilateral triangle"<<endl;
	}
	 if (a * a + b * b == c * c)
	{
		cout << "Right triangle"<<endl;
	}
	  if (a * a > b * b + c * c)
	{
		cout << "Obtuse triangle"<<endl;
	}
	   if (a * a < b * b + c * c)
	{
		cout << "Acute triangle"<<endl;
	}
	
	
	return 0;
}