You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('mivn', x))

Can you predict the output of `main_solution("qmkaraqbvj")` 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": "qmkaraqbvj"}, "ref_output": "\u00abmqq\u00bbi\u00abmmv\u00bbk\u00abnka\u00bbr\u00abaaq\u00bbb\u00abvrj\u00bb\u00aba\u00bb\u00abq\u00bb\u00abb\u00bb\u00abv\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('mivn', x))", "funcname": "main_solution"}
rule