You are given a code:

def main_solution(x):
    return func_20(('iav' + x), func_15('hde'))

Can you predict the output of `main_solution("vwvitszgz")` 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": "vwvitszgz"}, "ref_output": "i\u00abahv\u00bbv\u00abwdv\u00bbi\u00abtes\u00bbzgz", "ref_code": "def main_solution(x):\n    return func_20(('iav' + x), func_15('hde'))", "funcname": "main_solution"}
rule