You are given a code:

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

Can you predict the output of `main_solution("sernwpa")` 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": "sernwpa"}, "ref_output": "\u00absse\u00bbr\u00abnew\u00bbp\u00abard\u00bbn\u00abmnn\u00bb\u00abw\u00bb\u00abp\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'dnmn'))", "funcname": "main_solution"}
rule