You are given a code:

def main_solution(x):
    return func_20(func_15('srvwn'), (x + 'oech'))

Can you predict the output of `main_solution("vxgsjnhez")` 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": "vxgsjnhez"}, "ref_output": "\u00abvsx\u00bbg\u00absrj\u00bbn\u00abhve\u00bbz\u00abowe\u00bbc\u00abhn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('srvwn'), (x + 'oech'))", "funcname": "main_solution"}
rule