You are given a code:

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

Can you predict the output of `main_solution("zcuslku")` 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": "zcuslku"}, "ref_output": "l-u-g-h-vv-h-g-u-l", "ref_code": "def main_solution(x):\n    return func_9(func_13('lughv', '-'))", "funcname": "main_solution"}
rule