```import base64
fp = open("z","r").read()
base64_message = fp
while True:	base64_byte = base64_message[::-1]	base64_bytes = base64_byte.encode('ascii')	message_bytes = base64.b64decode(base64_bytes)	base64_message = message_bytes.decode('ascii')	if "CTF" in base64_message:		print base64_message		break```