You are given a code:

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

Can you predict the output of `main_solution("rogctwqkdb")` 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": "rogctwqkdb"}, "ref_output": "r\u00aboug\u00bbc\u00abtfw\u00bbq\u00abkhd\u00bbb\u00abfan\u00bbw\u00abxgj\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'fnwxj'), func_15('ufhag'))", "funcname": "main_solution"}
rule