#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
int main(){
	 int a,b,c;
	 cin>>a>>b>>c;
     int x[4]={0,a,b,c};
     sort(x+1,x+4);
     int d=sqrt(x[1]*x[1]+x[2]*x[2]);
     int e=sqrt(x[3]*x[3]);
     if(x[1]+x[2]<=x[3]){
     	cout<<"Not triangle"<<endl;
	 } 
	 if(d==e){
	 	cout<<"Right triangle"<<endl;
	 }
	  if(d>e){
	 	cout<<"Acute triangle"<<endl;
	 }
	 if(d<e){
	 
	 	cout<<"Obtuse triangle"<<endl;
	 }
	 if(a==b||a==c||b==c){
	cout<<"Isosceles triangle"<<endl;
	 }
	 if(a==b&&a==c){
	 	cout<<"Equilateral triangle"<<endl;
	 }

}