#include<iostream>
#include<math.h>
using namespace std;
int main()
{	
	int a,b,c,t;
	cin>>a>>b>>c;
	if(a>b){
		t=a;
		a=b;
		b=t;
	}
	else if(a>c){
		t=a;
		a=c;
		c=t;
	}
	else if(b>c){
	
		t=b;
		b=c;
		c=t;}
	if(a+b>c&&a+c>b&&b+c>a){
		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)
		cout<<"Isosceles triangle"<<endl;
		if(a==b&&b==c)
		cout<<"Equilateral triangle"<<endl;
	}
	else
	cout<<"Not triangle";
	}