You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'klmw'), func_15(x))

Can you predict the output of `main_solution("niaqsmmfkn")` 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": "niaqsmmfkn"}, "ref_output": "k\u00ablnm\u00bbw\u00abnii\u00bba\u00abqas\u00bbm\u00abmqf\u00bbk\u00abns\u00bb\u00abm\u00bb\u00abm\u00bb\u00abf\u00bb\u00abk\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'klmw'), func_15(x))", "funcname": "main_solution"}
rule