am am trying to use the following code in a cell:

=LEFT(Sheet1!S1,2)&left(x,2-LEN(sheet1!S1))

it's designed to extract the first two characters from S1 on sheet1, but if
there are not two characters there, to use the first two from a cell named
'x'.
It works fine when the target cell starts with alphas, but fails if the
target cell has nemerics for the first 2 chacters. Appreciate any guidance.