#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a[3];
	for(int i=1;i<=3;i++)
		cin>>a[i];
	sort(a+1,a+4);

	if(a[1]+a[2]<=a[3])
		cout<<"Not triangle";
	else
	{	
		long long x=a[1]*a[1],y=a[2]*a[2],z=a[3]*a[3];
		a[3]=sqrt(a[3]);
		if(x+y==z)
			cout<<"Right triangle"<<endl;
		if(x+y>z)
			cout<<"Acute triangle"<<endl;
		if(x+y<z)
			cout<<"Obtuse triangle"<<endl;

		if(a[1]==a[2]||a[1]==a[3]||a[2]==a[3])
			cout<<"Isosceles triangle"<<endl;

		if(a[1]==a[2]&&a[1]==a[3]&&a[2]==a[3])
			cout<<"Equilateral triangle";
	}
}