You are given a code:

def main_solution(x):
    return func_20(func_23(x, 3), func_15('ydcezd'))

Can you predict the output of `main_solution("fwxc")` 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": "fwxc"}, "ref_output": "f\u00abwyx\u00bbc\u00ab1d\u00bb\u00abc\u00bb\u00abe\u00bb\u00abz\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_23(x, 3), func_15('ydcezd'))", "funcname": "main_solution"}
rule