You are given a code:

def main_solution(x):
    return (func_11(x, 3) + func_15('qec'))

Can you predict the output of `main_solution("vnyynjhng")` 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": "vnyynjhng"}, "ref_output": "yqbbqmkqj\u00abq\u00bb\u00abe\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return (func_11(x, 3) + func_15('qec'))", "funcname": "main_solution"}
rule