You are given a code:

def main_solution(x):
    return func_20(func_15('qzjxf'), func_20('hqssq', x))

Can you predict the output of `main_solution("nxvzkapus")` 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": "nxvzkapus"}, "ref_output": "\u00abhqn\u00bbq\u00abxzs\u00bbv\u00absjz\u00bbq\u00abkxa\u00bbp\u00abufs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('qzjxf'), func_20('hqssq', x))", "funcname": "main_solution"}
rule