You are given a code:

def main_solution(x):
    return func_20(func_11(x, 4), func_15('fhdwv'))

Can you predict the output of `main_solution("rkdqsiy")` 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": "rkdqsiy"}, "ref_output": "v\u00abofh\u00bbu\u00abwhm\u00bbc\u00abd\u00bb\u00abw\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11(x, 4), func_15('fhdwv'))", "funcname": "main_solution"}
rule