#include <iostream>
using namespace std;
int main()
{int a,b,c;
int t,k,u;
cin>>a>>b>>c;
if(a>b&&a>c)t=c,c=a,a=t;
if(b>a&&b>c)k=c,c=b,b=t;
if(a>b)u=b,b=a,a=u;
if(a+b<=c)cout<<"Not triangle"<<endl;
if((a+b>c)&&(a*a+b*b==c*c))cout<<"Right triangle"<<endl;
if((a+b>c)&&(a*a+b*b<c*c))cout<<"Acute triangle"<<endl;
if((a+b>c)&&(a*a+b*b>c*c))cout<<"Obtuse triangle"<<endl;
if((a+b>c)&&(a==b||b==c||a==c))cout<<"Isosceles triangle"<<endl;
if((a+b>c)&&(a==b&&b==c))cout<<"Equilateral triangle"<<endl;
return 0;
}