Transform Data

Hello, sorry for the limited title description, but I was at a loss for how to actually describe what I am looking to do.

I have a workbook that has been kept for over 10 years and I would like to transform this data into a bit more usable form. In short, for any row, I have a number, which is currently a combination of an integer and a letter (either B, L or M). I would like to separate these, so the integer remains in the "#" column, while the letters are added to a separate column (for each letter). Alternatively, if this is easier, the letter could be just added to a single column.

An example is attached.

Columns A through E are what the format currently looks like. The options above that I described are H through L or N through P. The "Compound" column can be almost anything and there are many duplicates that should remain separate.

Thanks in advance for all your help.