Is there a name to this math problem?

when testing the for 'a' input the return is ['abnormal', 'arm-wrestling', 'absolute', 'airplane', 'airport']
why isnt 'amazing' or 'apple' in the list?

Thanks

what does it mean when it say that the word should be capitalized ONLY if the original word was capitalized?

My confusion is that in the example "the-stealth-warrior" gets converted to "theStealthWarrior". The original "stealth warrior" is lower case but the output is Upper case.