You are given a code:

def main_solution(x):
    return func_20(func_15('mky'), func_5('figs', 'nd'))

Can you predict the output of `main_solution("wwbnndwfov")` 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": "wwbnndwfov"}, "ref_output": "\u00abnmd\u00bbf\u00abikg\u00bbs\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('mky'), func_5('figs', 'nd'))", "funcname": "main_solution"}
rule