how can get last data entry +1 in to current

Hi,

I have to add data in a column which comes in a manner present in column A. I want it in a way as in column B. I mean when one or many empty row or row with "-" is there in between, the last entry should be brought adding 1 to it in current cell.

As after 22 empty space then it should be 22+1=23, not 28. Same after 40, not 46 but 40+1=41 and so on.

Thank you,

regards