You are given a code:

def main_solution(x):
    return func_20(func_15('gfrvs'), func_15('qojf'))

Can you predict the output of `main_solution("boabyhbfb")` 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": "boabyhbfb"}, "ref_output": "\u00ab\u00abgq\u00bb\u00bb\u00ab\u00abfo\u00bb\u00bb\u00ab\u00abrj\u00bb\u00bb\u00ab\u00abvf\u00bb\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('gfrvs'), func_15('qojf'))", "funcname": "main_solution"}
rule