#include <bits/stdc++.h>
using namespace std;
int main()
{	long long int a,b,c;
    cin>>a>>b>>c;
    if(a+b>c&&b+c>a&&a+c>b)
    {
        if((a*a)+(b*b)==c*c||(b*b)+(c*c)==a*a||(c*c)+(a*a)==b*b) cout<<"Right triangle"<<endl;
        else if((a*a)+(b*b)>c*c||(b*b)+(c*c)>a*a||(c*c)+(a*a)>b*b) cout<<"Acute triangle"<<endl;
        else if((a*a)+(b*b)<c*c||(b*b)+(c*c)<a*a||(c*c)+(a*a)<b*b) cout<<"Obtuse triangle"<<endl;
        if(a==b||b==c||a==c) cout<<"Isosceles triangle"<<endl;
        if(a==b&&b==c) cout<<"Equilateral triangle"<<endl;
    }
    else
    {
        cout<<"Not triangle";
    }
	return 0;
}