You are given a code:

def main_solution(x):
    return func_20(func_15('xchrl'), func_20('hqcj', 'dvaxhz'))

Can you predict the output of `main_solution("rdubjdlndu")` 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": "rdubjdlndu"}, "ref_output": "\u00abhxd\u00bbq\u00abvcc\u00bba\u00abjhx\u00bbh\u00abzr\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('xchrl'), func_20('hqcj', 'dvaxhz'))", "funcname": "main_solution"}
rule