HELP Newbie solve this Problem

[race9047 at my-deja.com]

Here is the Problem.
On the main directory there is a file called “data?”
The “data?” file is the preamble to the constitution.
The objective is to write a command that will give a list of how many
times the letters appear in the preamble. Try not to use awk.
Only letters, no spaces, and lower case.
The list can look like this:
7 a
12 b
16 c
. . .
3 z
But the real challenge is to invert the list to look like this:
a 7
b 12
c 16
. . .
z 3


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