You are given a code:

def main_solution(x):
    return func_20((x + x), func_15('ucvgj'))

Can you predict the output of `main_solution("axzgjjz")` 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": "axzgjjz"}, "ref_output": "a\u00abxuz\u00bbg\u00abjcj\u00bbz\u00abavx\u00bbz\u00abggj\u00bbj\u00abzj\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_15('ucvgj'))", "funcname": "main_solution"}
rule