You are given a code:

def main_solution(x):
    return func_9(func_15('ofnhh'))

Can you predict the output of `main_solution("hyumokv")` 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": "hyumokv"}, "ref_output": "\u00abo\u00bb\u00abf\u00bb\u00abn\u00bb\u00abh\u00bb\u00abh\u00bb\u00bbh\u00ab\u00bbh\u00ab\u00bbn\u00ab\u00bbf\u00ab\u00bbo\u00ab", "ref_code": "def main_solution(x):\n    return func_9(func_15('ofnhh'))", "funcname": "main_solution"}
rule