#include<bits/stdc++.h>
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";
		return 0;
	}
	if(a[1]==a[2]&&a[2]==a[3]&&a[1]==a[3]){
		cout<<"Acute triangle"<<endl;
		cout<<"Equilateral triangle"<<endl;
		cout<<"Isosceles triangle"<<endl;
		return 0;
	}
	if(a[1]==a[2]||a[2]==a[3]||a[3]==a[1]){
		cout<<"Isosceles triangle"<<endl;
	}
	if(a[1]*a[1]+a[2]*a[2]==a[3]*a[3]){
		cout<<"Right triangle"<<endl;
		return 0;
	}else if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3]){
		cout<<"Acute triangle"<<endl;
		return 0;
	}else if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3]){
		cout<<"Obtuse triangle"<<endl;
		return 0;
	}
	return 0;
}