#include<bits/stdc++.h>//c++万能头文件
using namespace std;

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