Hello, please excuse my bad English. I've googled but found nothing..

Say, I have 2 cells:

Cell A1: January 2015
Cell A2: *empty*

I want when I type in a number to cell A2, the number then turns to *number*-Jan-15. The Jan-15 is January 15 from cell A1.

So for example if I type 1 into cell A2:

Cell A1: January 2015
Cell A2: 1-Jan-15

Thank you..!