#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<string>
using namespace std;
int main()
{
	int a[10];
	cin>>a[1]>>a[2]>>a[3];
	sort(a+1,a+3+1);
	if(a[1]+a[2]<=a[3])
	{
		cout<<"Not triangle"<<endl;
		return 0;
	}	
	if(a[1]*a[1]+a[2]*a[2]==a[3]*a[3])
	    cout<<"Right triangle"<<endl;
	else if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3])
	    cout<<"Acute triangle"<<endl;
	else if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3])
	    cout<<"Obtuse triangle"<<endl;
	if(a[1]==a[2]&&a[2]==a[3]&&a[1]==a[3])
	    cout<<"Equilateral triangle"<<endl;
	else if(a[1]==a[2]||a[2]==a[3]||a[1]==a[3])
	    cout<<"Isosceles triangle"<<endl;
	return 0;
}