#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,s=0,x=0;
	cin>>a>>b>>c;
	if(a+b<=c||a+c<=b||b+c<=a){
		cout<<"Not triangle"<<endl;
		return 0;
	}
	if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a){
		cout<<"Right triangle"<<endl;
		s=1;
	}
	if(a*a+b*b>c*c||a*a+c*c>b*b||b*b+c*c>a*a){
		if(s!=1){
			cout<<"Acute triangle"<<endl;
			x=1;
		}
	}
	if(a*a+b*b<c*c||a*a+c*c<b*b||b*b+c*c<a*a){
		if(s!=1&&x!=1){
			cout<<"Obtuse triangle"<<endl;
		}
	}
	if(a==b||a==c||b==c){
		cout<<"Isosceles triangle"<<endl;
	}
	if(a==b&&b==c){
		cout<<"Equilateral triangle"<<endl;
	}
}