You are given a code:

def main_solution(x):
    return func_11(func_13('upce', '|'), 5)

Can you predict the output of `main_solution("mdl")` 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": "mdl"}, "ref_output": "z|u|h|j", "ref_code": "def main_solution(x):\n    return func_11(func_13('upce', '|'), 5)", "funcname": "main_solution"}
rule