You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_19('mdgqaa', 3))

Can you predict the output of `main_solution("hxxwqdgzu")` 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": "hxxwqdgzu"}, "ref_output": "\u00abqha\u00bba\u00abmxd\u00bbg\u00abx\u00bb\u00abw\u00bb\u00abq\u00bb\u00abd\u00bb\u00abg\u00bb\u00abz\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_19('mdgqaa', 3))", "funcname": "main_solution"}
rule