I want to brute force incrementally with two digits appended

[betsyjackson]

Suppose I want to brute force a keyspace from aaaa - zzzzzzzzzz. The first guesses are four characters, but the last guesses are ten characters. I also want to append two numbers to every guess.

aaaa00
aaaa01
aaaa02
...
zzzzzzzzzz97
zzzzzzzzzz98
zzzzzzzzzz99

Does anyone know how I would achieve that?