You are given a code:

def main_solution(x):
    return (func_5('kuca', 'db') + func_13('dby', '|'))

Can you predict the output of `main_solution("gjjtfffuld")` 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": "gjjtfffuld"}, "ref_output": "dbkucad|b|y", "ref_code": "def main_solution(x):\n    return (func_5('kuca', 'db') + func_13('dby', '|'))", "funcname": "main_solution"}
rule