<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def decrypt_text(self, text, *args, **kwargs):
 """ Decrypt a string. input: unicode str, output: unicode str """

        b = text.encode("utf-8")
        token = base64.b64decode(b)
        return self.decrypt(token, *args, **kwargs).decode("utf-8")