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