gistfile1.txt

1 {
h
d
}

/^[A-Z]/{
G                                       # append the hold space
s/\([A-Z]\)\n/\1/                       # put what was in the hold space on the same line
s/\([A-Z][0-9]\).*$/\1/                 # remove all but the first two chars
x                                       # now we're going to work on the hold space
s/^.\(.*\)$/\1/g                        # delete the first char
x                                       # put everything as it was
                                         
# now we should have each letter withn it's corresponding number on each line
}