I already see what is needed to make it working with letters too
Relevant Skills and Experience
I have 20 years experience with MS Excel/Access/VBA: databases, finance, statistics, accounting, CRM etc.
Proposed Milestones
£15 GBP - ready working code
Additional Services Offered
£0.01 GBP - Client gets whole access and rights for the code I made. Warranty covers any bugs detected later.