#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
//	freopen(".in","r",stdin);
//	freopen(".out","w",stdout);
	int a[3];
	cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	if(a[0]+a[1]<=a[2])
		cout<<"Not triangle"<<endl;
	if(a[0]*a[0]+a[1]*a[1]==a[2]*a[2])
		cout<<"Right triangle"<<endl;
	if(a[0]*a[0]+a[1]*a[1]>a[2]*a[2])
		cout<<"Acute triangle"<<endl;
	if(a[0]*a[0]+a[1]*a[1]<a[2]*a[2])
		cout<<"Obtuse triangle"<<endl;
	if(a[0]==a[1]||a[0]==a[2]||a[1]==a[2])
		cout<<"Isosceles triangle"<<endl;
	if(a[0]==a[1]&&a[1]==a[2])
		cout<<"Equilateral triangle"<<endl;
	return 0;
}