#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
	int a[3];
	for (int i = 0; i < 3; i++)
		cin >> a[i];
	for (int i = 0; i < 3; i++)
	{
		for (int j = 0; j < i; j++)
			if (a[i] < a[j])
				swap(a[i], a[j]);
	}
	if (a[0] + a[1] < a[2])
		cout << "Not triangle", exit(0);
	if (a[0] * a[0] + a[1] * a[1] == a[2] * a[2])
		cout << "Right triangle\n";
	if (a[0] * a[0] + a[1] * a[1] > a[2] * a[2])
		cout << "Acute triangle\n";
	if (a[0] * a[0] + a[1] * a[1] < a[2] * a[2])
		cout << "Obtuse triangle\n";
	if (a[0] == a[1] || a[0] == a[2] || a[1] == a[2])
		cout << "Isosceles triangle\n";
	if (a[0] == a[1] && a[0] == a[2])
		cout << "Equilateral triangle\n";
	exit(0);
}