You are given a code:

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

Can you predict the output of `main_solution("gfsvnvkixf")` 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": "gfsvnvkixf"}, "ref_output": "\u00abgjf\u00bbs\u00abvan\u00bbv\u00abkdi\u00bbxf1", "ref_code": "def main_solution(x):\n    return func_20(func_15('jad'), func_23(x, 3))", "funcname": "main_solution"}
rule