I have account strings that are separated by a different number of characters for each string. I need to pull everything left of a colon ":" to get the first piece of the account strings. Some of the accounts are 3 characters and some are 4. Ex. AAA:BBB:CCC; AAAA:BBB:CCC. I need to pull all the A's for everything left of the first colon. How would I do this?