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