You are given a code:

def main_solution(x):
    return (func_15('thyxz') + func_17('ygmq'))

Can you predict the output of `main_solution("begcx")` 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": "begcx"}, "ref_output": "\u00abt\u00bb\u00abh\u00bb\u00aby\u00bb\u00abx\u00bb\u00abz\u00bbqmgy", "ref_code": "def main_solution(x):\n    return (func_15('thyxz') + func_17('ygmq'))", "funcname": "main_solution"}
rule