You are given a code:

def main_solution(x):
    return ((x + 'gbop') + func_15('zbd'))

Can you predict the output of `main_solution("qhfqj")` 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": "qhfqj"}, "ref_output": "qhfqjgbop\u00abz\u00bb\u00abb\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return ((x + 'gbop') + func_15('zbd'))", "funcname": "main_solution"}
rule