You are given a code:

def main_solution(x):
    return func_11(func_13(x, '|'), 4)

Can you predict the output of `main_solution("obgwhwzftv")` 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": "obgwhwzftv"}, "ref_output": "s|f|k|a|l|a|d|j|x|z", "ref_code": "def main_solution(x):\n    return func_11(func_13(x, '|'), 4)", "funcname": "main_solution"}
rule