You are given a code:

def main_solution(x):
    return func_20(func_1(x, 3), func_15('aqfe'))

Can you predict the output of `main_solution("dqfez")` 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": "dqfez"}, "ref_output": "d\u00abqaf\u00bbe\u00abzqd\u00bbq\u00abffe\u00bbz\u00abdeq\u00bbfez", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 3), func_15('aqfe'))", "funcname": "main_solution"}
rule