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