#include<bits/stdc++.h>
using namespace std;
int main()
{
	int s[3]={0},a=0,b=0,c=0;
	cin>>s[0]>>s[1]>>s[2];
	sort(s,s+3);
	a=s[0];
	b=s[1];
	c=s[2];
	if((a+b)<=c)
{
	cout<<"Not triangle\n";
    return 0;
}
	else
	{
		if(((a^2)+(b^2))==(c^2))
		cout<<"Right triangle\n";
		if(((a^2)+(b^2))>(c^2))
		cout<<"Acute triangle\n";
		if(((a^2)+(b^2))<(c^2))
		cout<<"Obtuse triangle\n";
		if((a==b)||(b==c))
		cout<<"Isosceles triangle\n";
		if(a==c)
		cout<<"Equilateral triangle\n";
	return 0; }
}