#include <bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(a>c)
	swap(a,c);
	if(b>c)
	swap(b,c);
	if(a+b<c)
	{
    cout<<"Not triangle"<<endl;
    return 0;
    }
	if(pow(a,2)+pow(b,2)==pow(c,2))
	cout<<"Right triangle"<<endl;
	if(pow(a,2)+pow(b,2)>pow(c,2))
	cout<<"Acute triangle"<<endl;
	if(pow(a,2)+pow(b,2)<pow(c,2))
	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;
}