You are given a code:

def main_solution(x):
    return func_20(func_15('ach'), func_5('ppmrl', 'dljw'))

Can you predict the output of `main_solution("njabtcjkm")` 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": "njabtcjkm"}, "ref_output": "\u00abdal\u00bbj\u00abwcp\u00bbp\u00abmhr\u00bbl", "ref_code": "def main_solution(x):\n    return func_20(func_15('ach'), func_5('ppmrl', 'dljw'))", "funcname": "main_solution"}
rule