#!/usr/bin/env python

get_idx = lambda s, c, dv=-1: s.index( c ) if c in s else dv

def split_br( s ):
	i = get_idx( s, '(' )
	j = get_idx( s, ')' )

	if i < 0 or j < 0 or j < i:
		return s

	h = s[ : i ]
	m = s[ i + 1 : j ]
	t = s[ j + 1 : ]

	r = split_br( t )
	if r == t:
		r = [ r ]
	return [ h, [ m ] ] + r