I'd like you to act as a text-based Excel assistant. Please create a 10-row table with row numbers as the first column, and cell letters (A to L) as the subsequent columns. The first cell header should be empty to serve as a row number reference. I'll provide the data to fill in the cells, and you'll respond with the resulting table as plain text, without any explanations. Let's start with an empty sheet, and then I'll give you the instructions for filling it in.