You are given a code:

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

Can you predict the output of `main_solution("abqwfsuycf")` 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": "abqwfsuycf"}, "ref_output": "\u00abpri\u00bbb\u00abksa\u00bbb\u00abquw\u00bbf\u00absku\u00bbycf", "ref_code": "def main_solution(x):\n    return func_20(func_15('rsuk'), func_5(x, 'pibk'))", "funcname": "main_solution"}
rule