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