#include <bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<=c||a+c<=b||b+c<=a)
	{
		cout<<"Not triangle";
		return 0;
	}
	else
	{
		if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a)
			cout<<"Right triangle"<<endl;
		else
			if(a*a+b*b>c*c||a*a+c*c>b*b||b*b+c*c>a*a)
				cout<<"Acute triangle"<<endl;
		else
			if(a*a+b*b<c*c||a*a+c*c<b*b||b*b+c*c<a*a)
				cout<<"Obtuse triangle"<<endl;
		if(a==b&&a==c||b==c&&b==a||c==a&&c==b)
			cout<<"Isosceles triangle"<<endl;
		if(a==b&&a==c&&b==c)
			cout<<"Equilateral triangle"<<endl;	
	}
	return 0;
}

66分（还挺吉利）