I inherited a spreadsheet that consists of 2 sheets. Sheet 1 has a macro
that sorts data from sheet 2. This is how it works:

I enter "automotive" into Sheet 1 A2.
Then I press Ctrl A.
This command automatcally enters data into column B ( data from Sheet 2 that
is associated with "automotive" in Sheet 2.

I want to protect the entire Sheet 1 to protect the macros EXCEPT for A2. I
am able to protect the sheet except for A2 (so people could enter data such
as "automotive), but when I do the Ctrl A command, I get an error saying,

"Run-time error 1004: The cell or chart you are trying to change is
protected and therefore read only."

How can I protect A2 in Sheet 1 without affecting the macros?