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";
        return 0;
	}
    else{
        if(a==b&&b==c){
        	 cout<<"Equilateral triangle";
            return 0; 
		}
        else{
            if(a==b||b==c||a==c){
            	cout<<"Isosceles triangle";
                return 0;
			}
            else{
                if((a*a+b*b)==c*c||a*a==(b*b+c*c)||(a*a+c*c)==b*b){
                	cout<<"Right triangle";
                    return 0;
				}
                else{
                    if((a*a+b*b)<c*c||(b*b+c*c)<a*a||(a*a+c*c)<b*b){
                    	cout<<"Acute triangle";
                    	return 0;
					}
                    else
                        cout<<"Obtuse triangle";
                }
            }
        }
    }
    return 0;
 }