You are given a code:

def main_solution(x):
    return func_20('vpkl', 'kaimb')

Can you predict the output of `main_solution("bbhakovxd")` 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": "bbhakovxd"}, "ref_output": "vkpakilmb", "ref_code": "def main_solution(x):\n    return func_20('vpkl', 'kaimb')", "funcname": "main_solution"}
rule