You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('rhd', x))

Can you predict the output of `main_solution("pzgmuluyy")` 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": "pzgmuluyy"}, "ref_output": "\u00abrpp\u00bbh\u00abzzd\u00bbg\u00abmgu\u00bbl\u00abumy\u00bby\u00abu\u00bb\u00abl\u00bb\u00abu\u00bb\u00aby\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('rhd', x))", "funcname": "main_solution"}
rule