You are given a code:

def main_solution(x):
    return func_20(func_22(x), func_15('vpwldj'))

Can you predict the output of `main_solution("kvcwtntsvw")` 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": "kvcwtntsvw"}, "ref_output": "k\u00abvvc\u00bbw\u00abtpn\u00bbt\u00abswv\u00bbw\u00abl\u00bb\u00abd\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_22(x), func_15('vpwldj'))", "funcname": "main_solution"}
rule