Mirror selected cell in another

A macro was submitted in a similar thread, but I have a slightly different problem. I have empty cells, A1:A10, and in cells C1:C10 I have data. If A1 is selected, I would like to be able to click on any cell in colum C and that
info then appears in A1. Then I will select A2, and again, click on any cell
in C1:C10 and that appears in A2 and so on. I do not want cells A1 etc. to
change once populated. This can be a macro as well. Thanks!