You are given a code:

def main_solution(x):
    return func_9('busvf')

Can you predict the output of `main_solution("ekazvkbc")` 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": "ekazvkbc"}, "ref_output": "busvffvsub", "ref_code": "def main_solution(x):\n    return func_9('busvf')", "funcname": "main_solution"}
rule