You are given a code:

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

Can you predict the output of `main_solution("bapbidl")` 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": "bapbidl"}, "ref_output": "b-a-p-b-i-d-l-x-q-e-s-p", "ref_code": "def main_solution(x):\n    return func_13((x + 'xqesp'), '-')", "funcname": "main_solution"}
rule