You are given a code:

def main_solution(x):
    return func_13(func_1('amahvn', 3), '-')

Can you predict the output of `main_solution("fxquywfb")` 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": "fxquywfb"}, "ref_output": "a-m-a-h-v-n-a-m-a-h-v-n-a-m-a-h-v-n", "ref_code": "def main_solution(x):\n    return func_13(func_1('amahvn', 3), '-')", "funcname": "main_solution"}
rule