You are given a code:

def main_solution(x):
    return func_3('kbtsk')

Can you predict the output of `main_solution("swrsiz")` 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": "swrsiz"}, "ref_output": "bkkst", "ref_code": "def main_solution(x):\n    return func_3('kbtsk')", "funcname": "main_solution"}
rule