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 5fcaaf0e2529cd000c9304ce

Staircase

Going downstairs, while singing the alphabet song. Some vb practice to us all. Would it be much easier to make it go from left to right instead?

Start file

                         A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

End file

                         A
                        BB
                       CCC
                      DDDD
                     EEEEE
                    FFFFFF
                   GGGGGGG
                  HHHHHHHH
                 IIIIIIIII
                JJJJJJJJJJ
               KKKKKKKKKKK
              LLLLLLLLLLLL
             MMMMMMMMMMMMM
            NNNNNNNNNNNNNN
           OOOOOOOOOOOOOOO
          PPPPPPPPPPPPPPPP
         QQQQQQQQQQQQQQQQQ
        RRRRRRRRRRRRRRRRRR
       SSSSSSSSSSSSSSSSSSS
      TTTTTTTTTTTTTTTTTTTT
     UUUUUUUUUUUUUUUUUUUUU
    VVVVVVVVVVVVVVVVVVVVVV
   WWWWWWWWWWWWWWWWWWWWWWW
  XXXXXXXXXXXXXXXXXXXXXXXX
 YYYYYYYYYYYYYYYYYYYYYYYYY
ZZZZZZZZZZZZZZZZZZZZZZZZZZ

View Diff

1c1,26
<                          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
---
>                          A
>                         BB
>                        CCC
>                       DDDD
>                      EEEEE
>                     FFFFFF
>                    GGGGGGG
>                   HHHHHHHH
>                  IIIIIIIII
>                 JJJJJJJJJJ
>                KKKKKKKKKKK
>               LLLLLLLLLLLL
>              MMMMMMMMMMMMM
>             NNNNNNNNNNNNNN
>            OOOOOOOOOOOOOOO
>           PPPPPPPPPPPPPPPP
>          QQQQQQQQQQQQQQQQQ
>         RRRRRRRRRRRRRRRRRR
>        SSSSSSSSSSSSSSSSSSS
>       TTTTTTTTTTTTTTTTTTTT
>      UUUUUUUUUUUUUUUUUUUUU
>     VVVVVVVVVVVVVVVVVVVVVV
>    WWWWWWWWWWWWWWWWWWWWWWW
>   XXXXXXXXXXXXXXXXXXXXXXXX
>  YYYYYYYYYYYYYYYYYYYYYYYYY
> ZZZZZZZZZZZZZZZZZZZZZZZZZZ

Solutions by @_AlexLewin:

Created by: @filbranden Tweet

34 active golfers, 149 entries

Solutions by @_AlexLewin: