You are given a code:

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

Can you predict the output of `main_solution("kgjydmu")` 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": "kgjydmu"}, "ref_output": "k\u00abgjj\u00bby\u00abdrm\u00bbu\u00abuvm\u00bbd\u00abymj\u00bbg\u00abki\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9(x), func_15('jrvmi'))", "funcname": "main_solution"}
rule