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