You are given a code:

def main_solution(x):
    return (func_15('juk') + func_13('vzlpeu', '|'))

Can you predict the output of `main_solution("nmmg")` 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": "nmmg"}, "ref_output": "\u00abj\u00bb\u00abu\u00bb\u00abk\u00bbv|z|l|p|e|u", "ref_code": "def main_solution(x):\n    return (func_15('juk') + func_13('vzlpeu', '|'))", "funcname": "main_solution"}
rule