Expand horizontal characters in Vim in a row

abcde

and for the string next to it, separated by spaces.

a
B
c
d
e

I'd like to deploy vertically as shown in , but is there a command that makes this behavior simple for Vim?

(On the other hand, it seems that Shift+j can do the "vertical alignment" operation, but I couldn't find a way to do the heading operation...)

Thank you for your cooperation.