Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 52222f6ea98cbe0002000078

Letter case trickery

This file is in a downright esoteric format, consisting of hexadecimal numbers, non-hexadecimal keywords, and "Z" indicating end-of-line. Make the hexadecimal numbers lowercase.

Start file

A4E SUM 3C0Z
2B A9 NE F2Z

End file

a4e SUM 3c0Z
2b a9 NE f2Z

View Diff

1,2c1,2
< A4E SUM 3C0Z
< 2B A9 NE F2Z
---
> a4e SUM 3c0Z
> 2b a9 NE f2Z

Solutions by @aRkadeFR:

Created by: @NbTson Tweet

518 active golfers, 1630 entries

Solutions by @aRkadeFR: