You are given a code:

def main_solution(x):
    return func_20(func_15('wcseq'), (x + 'jhwjvo'))

Can you predict the output of `main_solution("qastetf")` 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": "qastetf"}, "ref_output": "\u00abqwa\u00bbs\u00abtce\u00bbt\u00abfsj\u00bbh\u00abwej\u00bbv\u00aboq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('wcseq'), (x + 'jhwjvo'))", "funcname": "main_solution"}
rule