You are given a code:

def main_solution(x):
    return (func_13(x, '-') + func_13('bmfd', '-'))

Can you predict the output of `main_solution("uzsxyhefeg")` 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": "uzsxyhefeg"}, "ref_output": "u-z-s-x-y-h-e-f-e-gb-m-f-d", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_13('bmfd', '-'))", "funcname": "main_solution"}
rule