You are given a code:

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

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