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