You are given a code:

def main_solution(x):
    return func_13(func_20('gdzzm', 'bjivc'), '|')

Can you predict the output of `main_solution("kyvvafshtd")` 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": "kyvvafshtd"}, "ref_output": "g|b|d|j|z|i|z|v|m|c", "ref_code": "def main_solution(x):\n    return func_13(func_20('gdzzm', 'bjivc'), '|')", "funcname": "main_solution"}
rule