You are given a code:

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

Can you predict the output of `main_solution("xbdvunv")` 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": "xbdvunv"}, "ref_output": "x|k|b|f|d|t|v|i|u|q|n|v", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'kftiq'), '|')", "funcname": "main_solution"}
rule