Remove Numbers - Leave Letters In A String?

I would like to take the below strings and remove any numbers and just leave letters. Or extract the payee from the string. If at all possible, I'd prefer this in a formula.

Card Purchase WAL Wal-Mart Sup 320004 0532 WAL-SAMS CENTRAL LA
Card Purchase WAL-MART #0532 053201 308 N AIRLINE HWY CENTRAL LA
Card Purchase LEBLANC'S FOOD S 874301 209 S. AIRLINE HWY CENTRAL LA[code]....

Basically, (the first line above) I'd like to remove the words "Card Purchase" and any numbers...or preferably just leave "Wal-Mart Sup" instead of the full string. I'd like the product of the first line to match the product of the 2nd line.