#include<bits/stdc++.h>
using namespace std;

void dosh(int a,int b,int c)//排序 
{
	if(a>b) swap(a,b);
	if(b>c) swap(b,c);
	if(a>c) swap(a,c);
}

void triangle(int a,int b,int c)//判断 
{
	if(a+b<=c||a==0||b==0||c==0)
	{
		cout<<"Not triangle\n";
		return;
	}	
	else if(a*a+b*b==c*c)
	{
		cout<<"Right triangle\n";
	}
	if(a*a+b*b>c*c)
	{
		cout<<"Acute triangle\n";
	}
	if(a*a+b*b<c*c)
	{
		cout<<"Obtuse triangle\n";
	}
	if(a==b||a==c||b==c) cout<<"Isosceles triangle\n";
	if(a==b&&b==c) cout<<"Equilateral triangle\n";
	return;	
}

int main()
{
	int l,n,m;
	cin>>l>>n>>m;
	dosh(l,n,m);
	triangle(l,n,m);
}