You are given a code:

def main_solution(x):
    return func_20(func_23(x, 2), func_15('hneqs'))

Can you predict the output of `main_solution("ylbwsgnfoy")` 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": "ylbwsgnfoy"}, "ref_output": "y\u00ablhb\u00bbw\u00absng\u00bbn\u00abfeo\u00bby\u00ab1q\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_23(x, 2), func_15('hneqs'))", "funcname": "main_solution"}
rule