#include<bits/stdc++.h>

using namespace std;

int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<c||b+c<a||a+c<b){
		cout<<"Not triangle"<<endl;
		return 0;
	}if((a*a+b*b)>c*c||(b*b+c*c)>a*a||(a*a+c*c)>b*b){
		cout<<"Acute triangle"<<endl;
	}else if((a*a+b*b)==c*c||(b*b+c*c)==a*a||(a*a+c*c)==b*b){
		cout<<"Right triangle"<<endl;
	}else if((a*a+b*b)<c*c||(b*b+c*c)<a*a||(a*a+c*c)<b*b){
		cout<<"Obtuse triangle"<<endl;
	}if(a==b||b==c||c==a){
		cout<<"Isosceles triangle"<<endl;
	}if(a==b&&b==c){
		cout<<"Equilateral triangle"<<endl;
	}
	
	return	0;
	}
    ```