You are given a code:

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

Can you predict the output of `main_solution("vrpsifhkxk")` 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": "vrpsifhkxk"}, "ref_output": "\u00abw\u00bb\u00abj\u00bb\u00abj\u00bb\u00abo\u00bb\u00abl\u00bb\u00abv\u00bb\u00abr\u00bb\u00abp\u00bb\u00abs\u00bb\u00abi\u00bb\u00abf\u00bb\u00abh\u00bb\u00abk\u00bb\u00abx\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_15(('wjjol' + x))", "funcname": "main_solution"}
rule