#include<iostream>
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\n";
	    return 0;
	}
	else if(a*a+c*c==b*b||b*b+c*c==a*a||a*a+b*b==c*c) cout<<"Right triangle\n";
	else if(a*a+b*b>c*c||b*b+c*c>a*a||a*a+c*c>b*b) cout<<"Acute triangle\n";
	else if(a*a+b*b<c*c||b*b+c*c<a*a||a*a+c*c<b*b) cout<<"Obtuse triangle\n"; 
    if(a==b||b==c||c==a) cout<<"Isosceles triangle\n";
	if(a==b&&b==c&&c==a) cout<<"Equilateral triangle\n";
    return 0;
}