You are given a code:

def main_solution(x):
    return func_13(func_20('cbhcd', x), '-')

Can you predict the output of `main_solution("iswmtt")` 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": "iswmtt"}, "ref_output": "c-i-b-s-h-w-c-m-d-t-t", "ref_code": "def main_solution(x):\n    return func_13(func_20('cbhcd', x), '-')", "funcname": "main_solution"}
rule