You are given a code:

def main_solution(x):
    return func_4(func_9('kdt'))

Can you predict the output of `main_solution("pcufveetwl")` 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": "pcufveetwl"}, "ref_output": "kdttdk", "ref_code": "def main_solution(x):\n    return func_4(func_9('kdt'))", "funcname": "main_solution"}
rule