#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long a[100];
    for(int i=1;i<=3;i++) 
		cin>>a[i]; 
    sort(a+1,a+1+3);
	if(a[1]+a[2]<=a[3]) cout<<"Not triangle"<<endl;
	if(a[1]*a[1]+a[2]*a[2]==a[3]*a[3]) cout<<"Right triangle"<<endl;
	if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3]) cout<<"Acute triangle"<<endl;
    if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3]) cout<<"Obtuse triangle"<<endl;
    if(a[1]==a[2]||a[1]==a[3]||a[2]==a[3]) cout<<"Isosceles triangle"<<endl;
	if(a[1]==a[2]&&a[2]==a[3]) cout<<"Equilateral triangle"<<endl;
    return 0;
}