text: from Tree import Tree
  from TreeNode import TreeNode
  
  input = [4,2,7,1,3,6,9]
  my_tree = Tree(TreeNode(input[0]))
  input.remove(input[0])
  
  for value in input:
      my_tree.insert(value)
  
  my_tree.print_tree()
  my_tree.invert_tree()
  my_tree.print_tree()