s = """A
	B
		C
		D
	E
F
G
	H
		I
K
   L"""

class CNode:
   children, parent, data = [], None, ""

   def __init__(self, parent, data):
      self.children = []
      self.parent = parent
      self.data = data

   def to_string(self):
      return "[" + self.data + ''.join([c.to_string() for c in self.children]) + "]"

   def to_dict(self):
      return dict((c.data, c.to_dict()) for c in self.children)

import re
r = re.compile(r'\S')

def get_indent_value(line):
   m = r.search(line)
   return (m.start(), m.group(0))

def get_parent(node, level):
   if level == 0:
      return node
   return get_parent(node.parent, level-1)

root = CNode(None,"")
parent = root
lines = s.split('\n')
level = 0
for line in lines:
   i, v = get_indent_value(line)
   if i < level:
      parent = get_parent(parent, level-i)
   if i > level:
      parent = current
   current = CNode(parent,v)
   parent.children.append(current)
   level = i

print root.to_string()
print root.to_dict()