Me again!

My brain must be fried today..... sigh...

What I want to know is ...................

Given a character string like '123456789', I want them to have commas in the correct place for output in the grid.

Like... '1,234,567,890'

I tried "@R9,999,999,999,999", but I got '1234567890'

If I try "9,999,999,999,999", I get 1,345,789, ????????????????????

I used to know this in another life... sigh....

OK gurus... what am I doing wrong today (besides breathing)????


Thanks!