#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";
		return 0;
	if (a[0]*a[0]+a[1]*a[1]>a[2]*a[2])
		if (a[0]==a[1]==a[2])
			cout<<"Equilateral triangle";
		else if (a[0]==a[1]||a[0]==a[2]||a[2]==a[1])
			cout<<"Isosceles triangle";
		cout<<"Acute triangle";
		return 0;
	if (a[0]*a[0]+a[1]*a[1]<a[2]*a[2])
		cout<<"Obtuse triangle";
		return 0;
	return 0;
}