#include<iostream>
using namespace std;
int a,b,c;
int main()
{
	cin>>a>>b>>c;
    if(b>a)  swap(a,b);
    if(c>a) swap(c,a);
    if(c>b) swap(b,c);
    if(c+b<a) cout<<"Not triangle\n";
    if(b*b+c*c>a*a) cout<<"Acute triangle\n";
    else if(b*b+c*c==a*a) cout<<"Right triangle\n";
    else if(b*b+c*c<a*a) cout<<"Obtuse triangle\n";
    if(a==b||b==c||a==c)   cout<<"Isosceles triangle\n";
    if(a==b&&a==c&&b==c) cout<<"Equilateral triangle\n";
}