#include<bits/stdc++.h>
using namespace std;
int main()
{
int a[3],t1,t2,t3;
cin>>a[3];
sort(a,a+3);
t1=a[0]*a[0];
t2=a[1]*a[1];
t3=a[2]*a[2];
if((a[0]+a[1]<=a[2])||(a[0]+a[2]<=a[1])||(a[1]+a[2]<=a[0])) cout<<"Not triangle";
else {if(t1+t2==t3) cout<<"Right triangle";
if(t1+t2<t3) cout<<"Acute triangle";
if(t1+t2>t3) cout<<"Obtuse triangle";
if((a[0]==a[1])&&(a[0]=a[2])) cout<<"Equilateral triangle";
if(a[0]==a[1]||a[0]==a[2]||a[1]==a[2]) cout<<"Isosceles triangle";
}
return 0;
}