You are given a code:

def main_solution(x):
    return func_20('uvunh', 'gccqb')

Can you predict the output of `main_solution("wkisxlnfo")` 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": "wkisxlnfo"}, "ref_output": "ugvcucnqhb", "ref_code": "def main_solution(x):\n    return func_20('uvunh', 'gccqb')", "funcname": "main_solution"}
rule