Hi !
I think I understand what you meen. Try the following:
1. Insert new column where you put your rank letters
2. fill in first three cells in column, example:
cellA1 A
cellA2 B
cellA3 C
3. select cells A1..A3
4. click a little square in the corner of he sellection and keep th
left mouse button pressed. Then extend the selection to the last row i
your data range and release mouse button.
You should get A,B,C,D,E,F.... order in your "Rank" column.
Hope it helped