You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_17('dsxb'))

Can you predict the output of `main_solution("cyisxw")` 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": "cyisxw"}, "ref_output": "\u00abbcx\u00bbs\u00abdy\u00bb\u00abi\u00bb\u00abs\u00bb\u00abx\u00bb\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_17('dsxb'))", "funcname": "main_solution"}
rule