You are given a code:

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

Can you predict the output of `main_solution("lmukktjowm")` 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": "lmukktjowm"}, "ref_output": "\u00aball\u00bbq\u00abmmr\u00bbu\u00abkuk\u00bbt\u00abjko\u00bbw\u00abmk\u00bb\u00abt\u00bb\u00abj\u00bb\u00abo\u00bb\u00abw\u00bb\u00abm\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('aqr', x))", "funcname": "main_solution"}
rule