You are given a code:

def main_solution(x):
    return func_20(func_15('bbfj'), func_1(x, 2))

Can you predict the output of `main_solution("yvyxgtq")` 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": "yvyxgtq"}, "ref_output": "\u00abybv\u00bby\u00abxbg\u00bbt\u00abqfy\u00bbv\u00abyjx\u00bbgtq", "ref_code": "def main_solution(x):\n    return func_20(func_15('bbfj'), func_1(x, 2))", "funcname": "main_solution"}
rule