You are given a code:

def main_solution(x):
    return func_20(func_15(x), (x + 'fdngew'))

Can you predict the output of `main_solution("eoggspdnu")` 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": "eoggspdnu"}, "ref_output": "\u00abeeo\u00bbg\u00abgos\u00bbp\u00abdgn\u00bbu\u00abfgd\u00bbn\u00abgse\u00bbw\u00abp\u00bb\u00abd\u00bb\u00abn\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'fdngew'))", "funcname": "main_solution"}
rule