You are given a code:

def main_solution(x):
    return (func_15(x) + func_5('dll', 'rwb'))

Can you predict the output of `main_solution("zxsomf")` 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": "zxsomf"}, "ref_output": "\u00abz\u00bb\u00abx\u00bb\u00abs\u00bb\u00abo\u00bb\u00abm\u00bb\u00abf\u00bbrwbdll", "ref_code": "def main_solution(x):\n    return (func_15(x) + func_5('dll', 'rwb'))", "funcname": "main_solution"}
rule