# [05AB1E], <s>7845</s> <s>535</s> 34

    BC

[Try it online!][TIO-kq3ix1lw]

[05AB1E]: https://github.com/Adriandmen/05AB1E
[TIO-kq3ix1lw]: https://tio.run/##yy9OTMpM/f/fyRmEAQ "05AB1E – Try It Online"

This converts the input from base `2` according to 05AB1E's codepage. `B` is mapped to 11 and `C` to 12. Digits larger or equal to the base are allowed and *"overflow"* into the next digit.  
This can be inverted by iterating the digits of the output in reverse:

    [D0Q#    "loop while TOS != 0"\
    2‰`      "divmod 10"\
    i        "if the last digit was 1:"\
     'Bˆ5-   "append ö to global array and subtract 5 from TOS"\
    ë        "else:"\
     'Cˆ6-   "append T to global array and subtrac 6 from TOS"\
    ]¯RJ     "after the loop: reverse global array and join"\

[Try it online!][TIO-kq3iyjt9]

[05AB1E]: https://github.com/Adriandmen/05AB1E
[TIO-kq3iyjt9]: https://tio.run/##fY89bsJAFIT7nGKyFKmQIIALJBpCRRPx00GkPONns9HCWrsLiI6Ky6RIKg4Ql75FLmLWGEVIkZhyNO97M9pSKLkoZoPGqAYvobROsVtKxZi@TvDYQ0PMH55/D9/vuEhEcrvSEZqlL3GVkDHckqHIOkQykQ47smh2fQhP/fzYqZcpSlNeR8hOcBqJ0iEpkDG0B3nbbkJnaOHQQWz0qizgz7PPvyesLFfEl/wY3BKn94AIbnlvP1/jYcWj2LGpevvZXRjesrH8H/Sh5VrMi6LVPgM "05AB1E – Try It Online"