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