You are given a code:

def main_solution(x):
    return func_20(func_15('oijb'), func_20('hrth', x))

Can you predict the output of `main_solution("npixxkyrh")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "npixxkyrh"}, "ref_output": "\u00abhon\u00bbr\u00abpit\u00bbi\u00abhjx\u00bbx\u00abkby\u00bbrh", "ref_code": "def main_solution(x):\n    return func_20(func_15('oijb'), func_20('hrth', x))", "funcname": "main_solution"}
rule