You are given a code:

def main_solution(x):
    return func_20(func_11(x, 2), func_15('spkpcz'))

Can you predict the output of `main_solution("flfdnwqlyr")` 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": "flfdnwqlyr"}, "ref_output": "h\u00abnsh\u00bbf\u00abppy\u00bbs\u00abnka\u00bbt\u00abp\u00bb\u00abc\u00bb\u00abz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11(x, 2), func_15('spkpcz'))", "funcname": "main_solution"}
rule