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