lab9

import functools
def comp(a, b):
    if len(a) >= len(b):
        return a
    else:
        return b
s = input()
print(len(list(filter(lambda x: x == '(', s))) == \
      len(list(filter(lambda x: x == ')', s))))
print(functools.reduce(comp, s.split()))
for i in filter(lambda x: \
                len(list(filter(lambda y: \
                           not y in \
    'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM', x))) != 0, \
                s.split()):
    print(i, end = ' ')