You are given a code:

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

Can you predict the output of `main_solution("lygdghwjb")` 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": "lygdghwjb"}, "ref_output": "\u00ablly\u00bbg\u00abdyg\u00bbh\u00abwgj\u00bbb\u00abbdf\u00bbs\u00abcga\u00bbp\u00abh\u00bb\u00abw\u00bb\u00abj\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'bfscap'))", "funcname": "main_solution"}
rule