You are given a code:

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

Can you predict the output of `main_solution("tgenacc")` 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": "tgenacc"}, "ref_output": "f|b|p|p|t|g|e|n|a|c|c", "ref_code": "def main_solution(x):\n    return func_13(('fbpp' + x), '|')", "funcname": "main_solution"}
rule