You are given a code:

def main_solution(x):
    return func_20(func_9(x), func_15('rjqpm'))

Can you predict the output of `main_solution("fegjbdtxll")` 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": "fegjbdtxll"}, "ref_output": "f\u00aberg\u00bbj\u00abbjd\u00bbt\u00abxql\u00bbl\u00ablpl\u00bbx\u00abtmd\u00bbbjgef", "ref_code": "def main_solution(x):\n    return func_20(func_9(x), func_15('rjqpm'))", "funcname": "main_solution"}
rule