You are given a code:

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

Can you predict the output of `main_solution("xfyhvsj")` 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": "xfyhvsj"}, "ref_output": "x\u00abfny\u00bbh\u00abvos\u00bbj\u00abgvc\u00bbm\u00abil\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'gcmi'), func_15('novll'))", "funcname": "main_solution"}
rule