#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<=c||b+c<=a||a+c<=b) cout<<"Not triangle"<<endl;
	if(a>=b&&a>=c){
		if(b*b+c*c>a*a) cout<<"Acute triangle"<<endl;
		if(b*b+c*c==a*a) cout<<"Right triangle"<<endl;
		if(b*b+c*c<a*a) cout<<"Obtuse triangle"<<endl;
	}
	else if(b>=a&&b>=c){
		if(a*a+c*c>b*b) cout<<"Acute triangle"<<endl;
		if(a*a+c*c==b*b) cout<<"Right triangle"<<endl;
		if(a*a+c*c<b*b) cout<<"Obtuse triangle"<<endl;
	}
	else{
		if(b*b+a*a>c*c) cout<<"Acute triangle"<<endl;
		if(b*b+a*a==c*c) cout<<"Right triangle"<<endl;
		if(b*b+a*a<c*c) 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;
}