You are given a code:

def main_solution(x):
    return (func_19('ateo', 3) + ('bmld' + 'ybmup'))

Can you predict the output of `main_solution("gjwekuj")` 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": "gjwekuj"}, "ref_output": "oatebmldybmup", "ref_code": "def main_solution(x):\n    return (func_19('ateo', 3) + ('bmld' + 'ybmup'))", "funcname": "main_solution"}
rule