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