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import base64

def safe_base64_decode(s):

    while len(s) % 4 != 0:

        s = s + '='

    return base64.b64decode(s)

assert b'abcd' == safe_base64_decode('YWJjZA=='),safe_base64_decode('YWJiZA==')

assert b'abcd' == safe_base64_decode('YWJjZA'),safe_base64_decode('YWJiZA')

print('ok')


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