#include<iostream>

using namespace  std;

int a,b,c;
int main()

{
   cin>>a>>b>>c;
   if(a+b<=c||b+c<=a||a+c<=b)
   cout<<"Not triangle"<<endl;
   if(a*a+b*b>c*c&&b*b+c*c>a*a&&a*a+c*c>b*b)
        cout<<"Acute triangle"<<endl;
   if(a*a+b*b==c*c||b*b+c*c==a*a||a*a+c*c==b*b)
        cout<<"Right triangle"<<endl;
   if(a*a+b*b<c*c||b*b+c*c<a*a||a*a+c*c<b*b)
        cout<<"Obtuse triangle"<<endl;
   if(a==b||b==c||c==a)
        cout<<"Isosceles triangle"<<endl;
   if(a==b&&a==c)
        cout<<"Equilateral triangle"<<endl;
    
	 return 0;
	
}