#include<iostream>
using namespace std;
int main() {
    int a,b,c,max=0,min=1000000000,m=0;
    cin>>a>>b>>c;
    if(a>max)
    {
    	max=a;
	}
	if(b>max)
    {
    	max=b;
	}
	if(c>max)
    {
    	max=c;
	}
	if(a<max&&a>min)
	{
		m=a;
	}
	if(b<max&&a>min)
	{
		m=b;
	}
	if(c<max&&c>min)
	{
		m=c;
	}
	if(a<min)
	{
		min=a;
	}
		if(b<min)
	{
		min=b;
	}
		if(c<min)
	{
		min=c;
	}
	if(min+m<=max)
	{
		cout<<"Not triangle"<<endl;
	}
	if(min*min+m*m==max*max)
	{
		cout<<"Right triangle"<<endl;
	}
	if(min*min+m*m>max*max)
	{
		cout<<"Acute triangle"<<endl;
	}
	if(min*min+m*m<max*max)
	{
		cout<<"Obtuse triangle"<<endl;
	}
	if(min==m||min==max)
	{
		cout<<"Isosceles triangle"<<endl;
	}
	if(min==m&&m==max)
	{
		cout<<"Equilateral triangle"<<endl;
	}
    return 0;
}