Chimpers Jane

Well, since this puzzle is designed for monkeys, clearly the combination must be something monkeys would think of easily.

Try the combination Banana-Banana-Banana-Banana.

> Try 1235. That's the security, adding one.

You're pretty sure BOTH OF THE INPUTED COMBINATIONS are invalid!

You see, the potential options are: an APPLE, an ORANGE, a CHERRY, and a ZERO as well for some reason. You're completely sick of this thing already, you never got the NUMBER FOUR as an ABSTRACT CONCEPT! You're pretty fine with OTHER NUMBERS, but that four sure is a doozy.