You are given a code:

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

Can you predict the output of `main_solution("zyyw")` 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": "zyyw"}, "ref_output": "z\u00ab|py\u00bb|\u00abyz|\u00bbw\u00aba\u00bb\u00abv\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '|'), func_15('pzavh'))", "funcname": "main_solution"}
rule