You are given a code:

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

Can you predict the output of `main_solution("gntwsox")` 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": "gntwsox"}, "ref_output": "i\u00abfgb\u00bbg\u00abnnt\u00bbw\u00absto\u00bbx\u00abw\u00bb\u00abs\u00bb\u00abo\u00bb\u00abx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('ifb' + x), func_15(x))", "funcname": "main_solution"}
rule