You are given a code:

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

Can you predict the output of `main_solution("ntbcwew")` 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": "ntbcwew"}, "ref_output": "n|d|t|t|b|t|c|x|w|n|e|u|w", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'dttxnu'), '|')", "funcname": "main_solution"}
rule