You are given a code:

def main_solution(x):
    return func_20(func_15('aekcld'), func_13('oxsvjs', '-'))

Can you predict the output of `main_solution("wfiwbj")` 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": "wfiwbj"}, "ref_output": "\u00aboa-\u00bbx\u00ab-es\u00bb-\u00abvk-\u00bbj\u00ab-cs\u00bb\u00abl\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('aekcld'), func_13('oxsvjs', '-'))", "funcname": "main_solution"}
rule