#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a[4];
   for(int i=1;i<=3;i++)
        cin>>a[i];
    sort(a+1,a+3+1);
	if(a[1]+a[2]<a[3])
		cout<<"Not triangle"<<'\n';
	if(a[1]*a[1]+a[2]*a[2]==a[3]*a[3])
		cout<<"Right triangle"<<'\n';
	if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3])
		cout<<"Acute triangle"<<'\n';
	if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3])
		cout<<"Obtuse triangle"<<'\n';
	if(a[1]==a[2]||a[1]==a[3]||a[2]==a[3])
		cout<<"Isosceles triangle"<<'\n';
	if(a[1]==a[2]&&a[2]==a[3])
		cout<<"Equilateral triangle"<<'\n';
	return 0;
}