Solution: Pirate Lingo
Answer: YOHOHO

Written by Caleb Hostetler

Each one of the nine "pirates" has a transformation that they perform on the input text, which can be determined through trial and error:

Pirate Effect Example
1 Take the second half of the string and append it to the end ABCDE -> ABCDEDE
2 Move the first letter to the end, then add EFF JBIG -> BIGJEFF
3 Replace double, triple, etc. with single letters BELLOW -> BELOW
4 Do a ROT13 cipher ABCDE -> NOPQR
5 If all of the letters in the string were alphabetized, replace all instances of the first letter with A, the second with H, and so on, indexing into AHOYMEMATEYSNOBEANSWERHERE. ADNOYX -> AHOYEM
6 Remove first and last letters HELLO -> ELL
7 Shift the string to the right by two letters, moving the rightmost two letters to the front WAGON -> ONWAG
8 Remove letters from the second half of the alphabet (N-Z) SPEW -> E
9 Swap each pair of two letters ABACUS -> BACASU

Then performing the appropriate transformations on ANSWERIS gives us

Operation Result
ANSWERIS
6 NSWERI
4 AFJREV
7 EVAFJR
2 VAFJREEFF
8 AFJEEFF
5 AOYHHOO
6 OYHHO
9 YOHHO
3 YOHO
1 YOHOHO

Author’s Notes

This was probably my favorite puzzle out of all of them. I was so happy when I was able to get a reasonable set of rules that made a coherent answer.