#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
for (int k = 1; k <= 2; k++)
for (int t, i = 1; i <= 2; i++)
{
if (a > b)
{
t = a;
a = b;
b = t;
}
if (b > c)
{
t = b;
b = c;
c = t;
}
}
if(a+b<=c)
cout<<"Not triangle"<<endl;
else
{
if(a*a+b*b==c*c)
cout<<"Right triangle"<<endl;
if(a*a+b*b>c*c)
cout<<"Acute triangle"<<endl;
if(a*a+b*b<c*c)
cout<<"Obtuse triangle"<<endl;
if(a==b&&a==c)
cout<<"Equilateral triangle"<<endl;
else if(a==b||b==c)
cout<<"Isosceles triangle"<<endl;
}
return 0;
}