You are given a code:

def main_solution(x):
    return func_5('stik', 'rqca')

Can you predict the output of `main_solution("kbnuwz")` 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": "kbnuwz"}, "ref_output": "rqcastik", "ref_code": "def main_solution(x):\n    return func_5('stik', 'rqca')", "funcname": "main_solution"}
rule