I have a registration routine
the credit card company that processes purchases needs a list of valid unlocking numbers.
each time a purchase is made the user is given the next unlocking number
I want to give them a list of 100 valid numbers are between 5000 and 9900
a valid entry could be yjk50kg00dky
with the number subtracted from the string it would be 5000
The next valid number would be yjk50kg01dky the nummbers in the string = 5001
the next 5002
the next 5003
all the way to a hundred.
the string would stay the same "yjkkgdky"
every number would be incremeted by 1
How to write this ?