You are given a code:

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

Can you predict the output of `main_solution("avvdif")` 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": "avvdif"}, "ref_output": "\u00abja|\u00bbt\u00ab|vz\u00bb|\u00abcv|\u00bbm\u00abd\u00bb\u00abi\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_13('jtzcm', '|'))", "funcname": "main_solution"}
rule