#include<iostream>
using namespace std;
int main()
{
int a,b,c,t;
cin>>a>>b>>c;
if(b<c)
swap(b,c);
if(a<b)
swap(a,b);
if((a+b<c) || (a+c<b) || (b+c<a)) cout<<"Not triangle"<<endl;
else{
	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(a==b || a==c || b==c) cout<<"Isosceles triangle"<<endl;
	if(a==b && a==c && b==c) cout<<"Equilateral triangle"<<endl;
} 
return 0;
}