You are given a code:

def main_solution(x):
    return (func_20('wbphxe', 'fnv') + func_5('hjm', 'cdk'))

Can you predict the output of `main_solution("zzubjh")` 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": "zzubjh"}, "ref_output": "wfbnpvhxecdkhjm", "ref_code": "def main_solution(x):\n    return (func_20('wbphxe', 'fnv') + func_5('hjm', 'cdk'))", "funcname": "main_solution"}
rule