操作字符串1

a = 'flag{8ozcvlpxhOonysqewjgfmrO0oporvzikhopyqnufcjwbgeamxds7iuojrpqtfgykOOxlwsbhn0OliOztgfocevbunyxjmkpws6tfhvnpdrqaaOOguzyewjkaibl0abulrfticqwepvxkjhOgds2wtbmyxdeikscvphajfro1ciOojegfswplxbyzoumvqarnkd}'
# a = 'baef1c1040a68f39afebb55e01b7d19e'
b = [var for var in a if var.isnumeric()]
c = ''.join(b)
print(c)