You are given a code:

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

Can you predict the output of `main_solution("mqrrfr")` 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": "mqrrfr"}, "ref_output": "\u00abnzf\u00bbs\u00abhsr\u00bbe\u00abeqr\u00bbh\u00absff\u00bbn\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('zsqfk'), func_9('nfshre'))", "funcname": "main_solution"}
rule