You are given a code:

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

Can you predict the output of `main_solution("tddmtnvtva")` 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": "tddmtnvtva"}, "ref_output": "t|d|d|m|t|n|v|t|v|aoudcbpifw", "ref_code": "def main_solution(x):\n    return (func_13(x, '|') + ('oudcb' + 'pifw'))", "funcname": "main_solution"}
rule