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 @TomofBedlam:

Unlock 9 remaining solutions by signing in and submitting your own entry
Created by: @NbTson

500 active golfers, 1553 entries

Solutions by @TomofBedlam:
10
#119 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:27PM

10
#>119 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:28PM

10
#>119 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:29PM

10
#>119 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:30PM

11
#>257 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:26PM

12
#>328 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:25PM

13
#>386 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:23PM

14
#>423 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:21PM

16
#>446 - Jordana Lachow / @TomofBedlam

01/12/2015 at 09:11PM