You are given a code:

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

Can you predict the output of `main_solution("bpikxlamen")` 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": "bpikxlamen"}, "ref_output": "b-p-i-k-x-l-a-m-e-nbiprilkvxtlmamen", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_20(x, 'irlvtm'))", "funcname": "main_solution"}
rule