Nice question. I particularly liked the inclusion of the string in the final select, so that people could see what was going on.

Surprised by some of the comments - I though everyone would know the what the character codes in the 9 to 13 range represent, I guess some of teh youngsters never needed to know that stuff because (a) modern text handling tools are a bit higher level that some of the old ones and (b) people stopped reading punched tape maybe 30 years ago.