You are given a code:

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

Can you predict the output of `main_solution("twnwpyhc")` 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": "twnwpyhc"}, "ref_output": "b\u00abttp\u00bbx\u00abxwm\u00bbm\u00abxnx\u00bbp\u00abtwb\u00bb\u00abp\u00bb\u00aby\u00bb\u00abh\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9('btpxxm'), func_15(x))", "funcname": "main_solution"}
rule