#include<bits/stdc++.h>
using namespace std;
int cmp(int a,int b){
	return a<b;
}

int main(){
	int d,b,c,a[10],e[10];
	for(int i=0;i<3;i++)
	{
		cin>>a[i];
	}
	sort(a,a+3,cmp);
	d=a[0];
	b=a[1];
	c=a[2];
	if(c>=d+b){ 
		cout<<"Not triangle"<<endl;
	} 
	else{
	if(d*d+b*b>c*c)cout<<"Acute triangle"<<endl;	
	if(d*d+b*b==c*c)cout<<"Right triangle"<<endl;
	if(d*d+b*b<c*c)cout<<"Obtuse triangle"<<endl;
	if(d==b&&b==c)cout<<"Equilateral triangle"<<endl;
	if(d==b||b==c)cout<<"Isosceles triangle"<<endl;	
	}
	return 0;
}