You are given a code:

def main_solution(x):
    return func_20(func_9('pnqb'), func_20(x, 'uyipt'))

Can you predict the output of `main_solution("vedrwptyfs")` 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": "vedrwptyfs"}, "ref_output": "pvnuqebybdqinrppwtptyfs", "ref_code": "def main_solution(x):\n    return func_20(func_9('pnqb'), func_20(x, 'uyipt'))", "funcname": "main_solution"}
rule