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