You are given a code:

def main_solution(x):
    return func_20(func_15('nkxv'), func_20(x, 'obo'))

Can you predict the output of `main_solution("bieqxccdb")` 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": "bieqxccdb"}, "ref_output": "\u00abbno\u00bbi\u00abbke\u00bbo\u00abqxx\u00bbc\u00abcvd\u00bbb", "ref_code": "def main_solution(x):\n    return func_20(func_15('nkxv'), func_20(x, 'obo'))", "funcname": "main_solution"}
rule