You are given a code:

def main_solution(x):
    return func_13(func_5(x, 'cpat'), '|')

Can you predict the output of `main_solution("lnnptviw")` 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": "lnnptviw"}, "ref_output": "c|p|a|t|l|n|n|p|t|v|i|w", "ref_code": "def main_solution(x):\n    return func_13(func_5(x, 'cpat'), '|')", "funcname": "main_solution"}
rule