python in a small turtle problem of multiple inheritance

The following code, guess what look will print?

class A: 
   DEF FUNC (Self): 
      Print ( 'A') 
class B (A): 
   # Pass 
   DEF FUNC (Self): 
      Print ( 'B') 
class C (A): 
   DEF FUNC (Self): 
      Print ( ' C ') 
class D (C): 
   DEF FUNC (Self): 
      Print (' D ') 

class E (B): Pass 
   # DEF FUNC (Self): 
   # Print (' E ') 
class F. (E, D): Pass 
   #def FUNC (Self): 
   # Print ( 'F') 

f = F () 
f.func () 

the order of succession to follow the breadth-first principle