You are given a code:

def main_solution(x):
    return func_9('ypqkdy')

Can you predict the output of `main_solution("wejjxnav")` 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": "wejjxnav"}, "ref_output": "ypqkdyydkqpy", "ref_code": "def main_solution(x):\n    return func_9('ypqkdy')", "funcname": "main_solution"}
rule