#include <bits/stdc++.h>
using namespace std;
int main() {
	int a,b,c;
	cin >>a>>b>>c;
	int s[3]={a,b,c};

	sort(s,s+3);
	if(s[0]+s[1]<=s[2]) {
		cout <<"Not triangle"<<endl;
	} 
    else{
	
		if(s[0]*s[0]+s[1]*s[1]==s[2]*s[2]) 
		{
			cout <<"Right triangle"<<endl;   //直角
		} 
		else if(s[0]*s[0]+s[1]*s[1]>s[2]*s[2]) 
		{
			cout <<"Acute triangle"<<endl;    //锐角
		} 
		else 
		{
		cout <<"Obtuse triangle"<<endl;    //钝角
     	} 
	if(s[0]+s[1]>s[2] &&a==b&&b==c)
		{
			cout <<"Equilateral triangle"<<endl;
		} 
	if((a==b||a==c)&&s[0]+s[1]>s[2])
		{
			cout <<"Isosceles triangle"<<endl;
		}

	}



	return 0;
}