You are given a code:

def main_solution(x):
    return func_20(func_15('xgtkex'), func_1('ttav', 2))

Can you predict the output of `main_solution("pttkpx")` 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": "pttkpx"}, "ref_output": "\u00abtxt\u00bba\u00abvgt\u00bbt\u00abatv\u00bb\u00abk\u00bb\u00abe\u00bb\u00abx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('xgtkex'), func_1('ttav', 2))", "funcname": "main_solution"}
rule