You are given a code:

def main_solution(x):
    return func_20(func_15('yhgt'), (x + 'ztfuo'))

Can you predict the output of `main_solution("auxpcntpf")` 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": "auxpcntpf"}, "ref_output": "\u00abayu\u00bbx\u00abphc\u00bbn\u00abtgp\u00bbf\u00abztt\u00bbfuo", "ref_code": "def main_solution(x):\n    return func_20(func_15('yhgt'), (x + 'ztfuo'))", "funcname": "main_solution"}
rule