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