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