You are given a code:

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

Can you predict the output of `main_solution("fpnxkbmycq")` 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": "fpnxkbmycq"}, "ref_output": "f|b|p|j|n|f|x|j|k|b|m|y|c|q", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'bjfj'), '|')", "funcname": "main_solution"}
rule