You are given a code:

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

Can you predict the output of `main_solution("tbdbdvugh")` 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": "tbdbdvugh"}, "ref_output": "b|f|q|r|s|f|e|d|t|r", "ref_code": "def main_solution(x):\n    return func_13(('bfqr' + 'sfedtr'), '|')", "funcname": "main_solution"}
rule