You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_9('dcbpd'))

Can you predict the output of `main_solution("zhfuihdnb")` 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": "zhfuihdnb"}, "ref_output": "\u00abdzc\u00bbb\u00abphd\u00bbd\u00abpfb\u00bbc\u00abdu\u00bb\u00abi\u00bb\u00abh\u00bb\u00abd\u00bb\u00abn\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_9('dcbpd'))", "funcname": "main_solution"}
rule