You are given a code:

def main_solution(x):
    return func_20(func_15('xlvxp'), func_11(x, 1))

Can you predict the output of `main_solution("wbwkxzeupp")` 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": "wbwkxzeupp"}, "ref_output": "\u00abxxc\u00bbx\u00ablly\u00bba\u00abfvv\u00bbq\u00abqx\u00bb\u00abp\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('xlvxp'), func_11(x, 1))", "funcname": "main_solution"}
rule