You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_19('avkqok', 1))

Can you predict the output of `main_solution("zhvacx")` 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": "zhvacx"}, "ref_output": "\u00abvzk\u00bbq\u00abohk\u00bba\u00abv\u00bb\u00aba\u00bb\u00abc\u00bb\u00abx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_19('avkqok', 1))", "funcname": "main_solution"}
rule