#include<bits/stdc++.h>
using namespace std;
int a,b,c;

int main()
{
    cin>>a>>b>>c;
    int x=min(a,min(b,c));
    int z=max(a,max(b,c));
    int y=a+b+c-x-z;
    if(x+y<z)
    {
        cout<<"Not triangle";
        return 0;
    }
    if(x*x+y*y==z*z) cout<<"Right triangle"<<endl;
    if(x*x+y*y>z*z) cout<<"Acute triangle"<<endl;
    if(x*x+y*y<z*z) cout<<"Obtuse triangle"<<endl;
    if(x==z||x==y||y==z) cout<<"Isosceles triangle"<<endl;
    if(x==z&&x==y&&y==z) cout<<"Equilateral triangle"<<endl;
    
    return 0;
}