You are given a code:

def main_solution(x):
    return (func_15('btlj') + func_1('bchjhy', 3))

Can you predict the output of `main_solution("uzqfub")` 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": "uzqfub"}, "ref_output": "\u00abb\u00bb\u00abt\u00bb\u00abl\u00bb\u00abj\u00bbbchjhybchjhybchjhy", "ref_code": "def main_solution(x):\n    return (func_15('btlj') + func_1('bchjhy', 3))", "funcname": "main_solution"}
rule