You are given a code:

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

Can you predict the output of `main_solution("swpa")` 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": "swpa"}, "ref_output": "\u00abssw\u00bbp\u00abawl\u00bbk\u00abzpj\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'lkzj'))", "funcname": "main_solution"}
rule