#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[3];
	cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	if(a[0]+a[1]<a[2])cout<<"Not triangle"<<endl;
	else
	{
		if(a[0]*a[0]+a[1]*a[1]==a[2]*a[2])cout<<"Right triangle"<<endl;
		else if(a[0]*a[0]+a[1]*a[1]>a[2]*a[2])cout<<"Acute triangle"<<endl;
		else if(a[0]*a[0]+a[1]*a[1]<a[2]*a[2])cout<<"Obtuse triangle"<<endl;
		if(a[1]==a[2]||a[1]==a[0])
		{
			cout<<"Isosceles triangle"<<endl;
			if(a[0]==a[1]&&a[1]==a[2])cout<<"Equilateral triangle"<<endl;
		}
	}
	return 0;
}