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