Complicated Question involving INDEX, ADDRESS, MATCH, ROW, etc.

Values are as follows:

Cell A1 is a calculated value between 1 and 26. In this case, it equals 19
Cell A2 is the letter "J"


In Row 19, Columns A through Z, I have one letter of the alphabet in each cell, in sequence, BUT I'm starting with the letter "S".
So, A19="S", B19="T" ...Y19="Q", Z19="R"

Here's what I'm trying to accomplish:

I want a formula to determine the intersecting column for the value in A2 in the row specified in A1.

MATCH(A2,$A$19:$Z$19) will work; however, I need to calculate the lookup_array value.

=CONCATENATE(ADDRESS(A1,1),":",ADDRESS(A1,26)) will produce the correct lookup array value, BUT...

Unfortunately, when I imbed the CONCATENATE function iside the MATCH function as the 2nd parameter, the resultant equation errors out.

Any help would be appreciated, thank you.

That's exactly what I wanted; thank you for replying so quickly...