You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('fxwe', x))

Can you predict the output of `main_solution("vfhpfjd")` 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": "vfhpfjd"}, "ref_output": "\u00abfvv\u00bbx\u00abffw\u00bbh\u00abehp\u00bbf\u00abjpd\u00bb\u00abf\u00bb\u00abj\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('fxwe', x))", "funcname": "main_solution"}
rule