You are given a code:

def main_solution(x):
    return func_20(func_15('zmnvt'), func_13('wkjv', '|'))

Can you predict the output of `main_solution("dakj")` 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": "dakj"}, "ref_output": "\u00abwz|\u00bbk\u00ab|mj\u00bb|\u00abvn\u00bb\u00abv\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('zmnvt'), func_13('wkjv', '|'))", "funcname": "main_solution"}
rule