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