You are given a code:

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

Can you predict the output of `main_solution("ofucvfixsb")` 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": "ofucvfixsb"}, "ref_output": "l-b-o-y-b-ii-b-y-o-b-l", "ref_code": "def main_solution(x):\n    return func_9(func_13('lboybi', '-'))", "funcname": "main_solution"}
rule