Count Occurrences Of Numbers & Letters In Single Cells

I have identification numbers and letters which go on telephone boxes.

Like CVR 1-2-3-4-R
DVR 5-6-7-8-9-11-L
DVR-0-1R

What I need is to find the total number of letters and numbers I need for the job.
I did a find and replace with a blank which deletes that item and I write the number of deletions down. I continue until nothing is left. I need numbers 0 thru 9, letters A-Z and any other character like "-".

Above example C=1,D=2,V=3,R=5 etc. My list is in Colulmn "A" and the count can be Column "B"

Thanks

Re: Count Occurrences Of Numbers & Letters In Single Cells

That gave me the start I needed. Attached is what I used by adding sumproduct to the formula.

I put the Letters, Numbers and Characters in row "A"
Data in range A3-A10

=SUMPRODUCT(LEN($A3:$A10)-LEN(SUBSTITUTE( UPPER($A3:$A10),B$1,"")))

Thanks for your usual support!