def total_yngve_depth(yngve_tree_root):
    """Returns the total depth of the ynvge tree of the sentence

		Args:
			yngve_tree_root (obj): The root node 

		Returns:
			int: The total depth of the yngve tree
	"""
    tot_score = 0
    for leaf in yngve_tree_root.leaves:
        tot_score += leaf.score
    return tot_score