# [*><>](//esolangs.org/wiki/Starfish), 30 bytes
    cn"00:"ooo5Sdo"--:--"ooooo5Sdo
[Online test.](//starfish.000webhostapp.com?script=MYOwRADBBcYPYIKwGUAmcwFpPW-BSacQA)

I feel this is much simpler and more different than redstarcoder's algorithm, and thus I posted it as separate.

Replaces output in-place.