You are given a code:

def main_solution(x):
    return (func_13('vbkkl', '|') + func_15('cenjfq'))

Can you predict the output of `main_solution("xlfgdbm")` 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": "xlfgdbm"}, "ref_output": "v|b|k|k|l\u00abc\u00bb\u00abe\u00bb\u00abn\u00bb\u00abj\u00bb\u00abf\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return (func_13('vbkkl', '|') + func_15('cenjfq'))", "funcname": "main_solution"}
rule