You are given a code:

def main_solution(x):
    return func_20(('zxmuq' + 'vqefj'), func_4('fjewzc'))

Can you predict the output of `main_solution("vagnsjikp")` 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": "vagnsjikp"}, "ref_output": "zfxjmeuwqzvcqefj", "ref_code": "def main_solution(x):\n    return func_20(('zxmuq' + 'vqefj'), func_4('fjewzc'))", "funcname": "main_solution"}
rule