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