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