You are given a code:

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

Can you predict the output of `main_solution("aofqwgbc")` 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": "aofqwgbc"}, "ref_output": "\u00abdaa\u00bbk\u00abooz\u00bbf\u00abqfw\u00bbg\u00abbqc\u00bb\u00abw\u00bb\u00abg\u00bb\u00abb\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('dkz', x))", "funcname": "main_solution"}
rule