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