You are given a code:

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

Can you predict the output of `main_solution("fvafk")` 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": "fvafk"}, "ref_output": "f\u00abvwa\u00bbf\u00abkoh\u00bbd\u00abjmi\u00bbhw", "ref_code": "def main_solution(x):\n    return func_20((x + 'hdjihw'), func_15('wom'))", "funcname": "main_solution"}
rule