You are given a code:

def main_solution(x):
    return func_20(func_20('ynfffj', x), func_15('hvruo'))

Can you predict the output of `main_solution("maqqvik")` 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": "maqqvik"}, "ref_output": "y\u00abmhn\u00bba\u00abfvq\u00bbf\u00abqrf\u00bbv\u00abjui\u00bbk\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('ynfffj', x), func_15('hvruo'))", "funcname": "main_solution"}
rule