You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_13('azqabq', '-'))

Can you predict the output of `main_solution("hjgstb")` 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": "hjgstb"}, "ref_output": "\u00abah-\u00bbz\u00ab-jq\u00bb-\u00abag-\u00bbb\u00ab-sq\u00bb\u00abt\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_13('azqabq', '-'))", "funcname": "main_solution"}
rule