You are given a code:

def main_solution(x):
    return func_20(func_15('vrrbiq'), func_9(x))

Can you predict the output of `main_solution("skjwmttnjk")` 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": "skjwmttnjk"}, "ref_output": "\u00absvk\u00bbj\u00abwrm\u00bbt\u00abtrn\u00bbj\u00abkbk\u00bbj\u00abnit\u00bbt\u00abmqw\u00bbjks", "ref_code": "def main_solution(x):\n    return func_20(func_15('vrrbiq'), func_9(x))", "funcname": "main_solution"}
rule