You are given a code:

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

Can you predict the output of `main_solution("iaurpwtda")` 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": "iaurpwtda"}, "ref_output": "\u00abiia\u00bbu\u00abrap\u00bbw\u00abtud\u00bba\u00abzrn\u00bbp\u00abmpi\u00bb\u00abw\u00bb\u00abt\u00bb\u00abd\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'znpmi'))", "funcname": "main_solution"}
rule