You are given a code:

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

Can you predict the output of `main_solution("duxvldph")` 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": "duxvldph"}, "ref_output": "\u00abddu\u00bbx\u00abvul\u00bbd\u00abpxh\u00bbr\u00abqvs\u00bbu\u00abl\u00bb\u00abd\u00bb\u00abp\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'rqsu'))", "funcname": "main_solution"}
rule