#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    int a,b,c;
    cin>>a>>b>>c;
    int num1=pow(a,2);
    int num2=pow(b,2);
    int num3=pow(c,2);
	if(a>=b&&a>=c)
    {
        if(a>b+c)
        {
            cout<<"Not triangle"<<endl;
        }
        else
        {
            if(num2+num3==num1)
            {
                cout<<"Right triangle"<<endl;
            }
            else if(num2+num3>num1)
            {
                cout<<"Acute triangle"<<endl;
            }
            else
            {
                cout<<"Obtuse triangle"<<endl;
            }
        }
    }
    else if(b>=a&&b>=c)
    {
        if(b>a+c)
        {
            cout<<"Not triangle"<<endl;
        }
        else
        {
            if(num1+num3==num2)
            {
                cout<<"Right triangle"<<endl;
            }
            else if(num1+num3>num2)
            {
                cout<<"Acute triangle"<<endl;
            }
            else 
            {
                cout<<"Obtuse triangle"<<endl;
            }
        }
    }
    else if(c>=b&&c>=a)
    {
        if(c>b+a)
        {
            cout<<"Not triangle"<<endl;
        }
        else
        {
            if(num1+num2==num3)
            {
                cout<<"Right triangle"<<endl;
            }
            else if(num2+num1>num3)
            {
                cout<<"Acute triangle"<<endl;
            }
            else
            {
                cout<<"Obtuse triangle"<<endl;
            }
        }
    }
    if(a==b||a==c||b==c)
    {
        cout<<"Isosceles triangle"<<endl;
    }

    if(a==b&&b==c)
    {
        cout<<"Equilateral triangle"<<endl;
    }
    return 0;
}