You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_1('nbsok', 3))

Can you predict the output of `main_solution("rxzyowb")` 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": "rxzyowb"}, "ref_output": "\u00abnrb\u00bbs\u00aboxk\u00bbn\u00abbzs\u00bbo\u00abkyn\u00bbb\u00absoo\u00bbk\u00abw\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('nbsok', 3))", "funcname": "main_solution"}
rule