uncnf.py

from re import *
from sys import stdin

uncnf = lambda g: g if type(g) == str else tuple(map(uncnf, g[match(r'\[X[1-9][0-9]*\]', g[0])!=None:]))
pyfy = lambda l: eval((sub('([^ (]) +', r'\1,', sub('([^() ]+)', r'"\1"', sub('([()])', r' \1 ', l).strip()))))

def _clean(g):
    for gg in g:
        if str in (type(gg), type(gg[0])):
            yield gg
        else:
            for ggg in gg:
                yield ggg

clean = lambda g: g if type(g) == str else tuple(map(clean, _clean(g)))

for l in stdin:
    print str( clean(uncnf(pyfy(l))) ).replace("'", '').replace(',','')