#include<bits/stdc++.h>
using namespace std;
int a[10]; 
int main() {
	cin>>a[1]>>a[2]>>a[3];
	sort(a+1,a+4);
	if(a[1]+a[2]<a[3]){
		cout<<"Not triangle";
		return 0;
	}
	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<<"Isosceles 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<<"Isosceles triangle"<<endl;
	if(a[1]==a[2]&&a[2]==a[3])cout<<"Equilateral triangle"<<endl;
    return 0;
}