You are given a code:

def main_solution(x):
    return func_20(func_19('qbeju', 1), func_15('nqt'))

Can you predict the output of `main_solution("fmdjcwzxnk")` 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": "fmdjcwzxnk"}, "ref_output": "b\u00abenj\u00bbu\u00abqq\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19('qbeju', 1), func_15('nqt'))", "funcname": "main_solution"}
rule