You are given a code:

def main_solution(x):
    return func_9(func_13('thbpn', '-'))

Can you predict the output of `main_solution("ycjkkkpgny")` 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": "ycjkkkpgny"}, "ref_output": "t-h-b-p-nn-p-b-h-t", "ref_code": "def main_solution(x):\n    return func_9(func_13('thbpn', '-'))", "funcname": "main_solution"}
rule