#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"<<endl;
	if(a*a+b*b>c*c||a*a+c*c>b*b||b*b+c*c>a*a)
	  cout<<"Acute triangle"<<endl;
	  if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a)
	    cout<<"Right triangle"<<endl;
	    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)
	        cout<<"Isosceles triangle"<<endl;
	        if(a==b==c)
	          cout<<"Equilateral triangle"<<endl;
return 0;
}