You are given a code:

def main_solution(x):
    return ((x + x) + func_15('ucjapm'))

Can you predict the output of `main_solution("hiesx")` 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": "hiesx"}, "ref_output": "hiesxhiesx\u00abu\u00bb\u00abc\u00bb\u00abj\u00bb\u00aba\u00bb\u00abp\u00bb\u00abm\u00bb", "ref_code": "def main_solution(x):\n    return ((x + x) + func_15('ucjapm'))", "funcname": "main_solution"}
rule