Finding Negative Numbers

I have this sheet.

If there is/are negative number(s) between DATA cells written A Column, I want spot them writting YES or NO

As seen at the example:

- There is no negative number between A1:A3 so when DATA is written NO must be written just next cell (B3)

- There is no negative number between A3:A13, the result is same

- There is one negative number (A20) between A13:A26, YES is written next cell (B26)

I can arrange A column. The question is this:

What kind of function must be written at the B Column that;

When does Excel spot the "DATA", Excel must search the field between the last two DATA cells and if there is negative number or not, YES or NO must be written in the cell just next the last DATA cell ?

Thanks a lot for help.

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