You are given a code:

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

Can you predict the output of `main_solution("pjmnoxqqmb")` 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": "pjmnoxqqmb"}, "ref_output": "\u00abopp\u00bbj\u00abjji\u00bbm\u00abimn\u00bbn\u00abonx\u00bbx\u00abqoq\u00bbm\u00abbx\u00bb\u00abq\u00bb\u00abq\u00bb\u00abm\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('ojiinx', x))", "funcname": "main_solution"}
rule