You are given a code:

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

Can you predict the output of `main_solution("cpadfar")` 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": "cpadfar"}, "ref_output": "\u00abtcv\u00bbn\u00abppl\u00bbl\u00abpan\u00bbv\u00abtd\u00bb\u00abf\u00bb\u00aba\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_9('tvnpl'))", "funcname": "main_solution"}
rule