#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 ){
		cout<<"Not triangle";
	}else{	
	    if(a*a+b*b==c*c || b*b+c*c==a*a || a*a+c*c==b*b){
		cout<<"Right triangle"<<endl;
	   }if(a*a+b*b>c*c && b*b+c*c>a*a && a*a+c*c>b*b){
			cout<<"Acute triangle"<<endl;
		}if(a*a+b*b<c*c && b*b+c*c<a*a && a*a+c*c<b*b){
      cout<<"Obtuse triangle"<<endl;
		}if(a==b || b==c || a==c){
		    cout<<"Isosceles triangle"<<endl;
		    if(a==b && b==c && a==c){
		    	cout<<"Equilateral triangle"<<endl;
			}
	    }
	}
	return 0;
}