You are given a code:

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

Can you predict the output of `main_solution("ktcup")` 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": "ktcup"}, "ref_output": "w|i|d|v|n|u|p|u|k|t|x", "ref_code": "def main_solution(x):\n    return func_13(func_20('wdnpk', 'ivuutx'), '|')", "funcname": "main_solution"}
rule