You are given a code:

def main_solution(x):
    return func_20(func_15('mmh'), func_20(x, 'kfdei'))

Can you predict the output of `main_solution("luobfjjr")` 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": "luobfjjr"}, "ref_output": "\u00ablmk\u00bbu\u00abfmo\u00bbd\u00abbhe\u00bbfijjr", "ref_code": "def main_solution(x):\n    return func_20(func_15('mmh'), func_20(x, 'kfdei'))", "funcname": "main_solution"}
rule