You are given a code:

def main_solution(x):
    return func_13(('qadfxj' + x), '|')

Can you predict the output of `main_solution("apbvbpttk")` 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": "apbvbpttk"}, "ref_output": "q|a|d|f|x|j|a|p|b|v|b|p|t|t|k", "ref_code": "def main_solution(x):\n    return func_13(('qadfxj' + x), '|')", "funcname": "main_solution"}
rule