You are given a code:

def main_solution(x):
    return (func_23('eddbj', 3) + ('odo' + 'nlc'))

Can you predict the output of `main_solution("mfbnf")` 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": "mfbnf"}, "ref_output": "eddbj1odonlc", "ref_code": "def main_solution(x):\n    return (func_23('eddbj', 3) + ('odo' + 'nlc'))", "funcname": "main_solution"}
rule