You are given a code:

def main_solution(x):
    return func_20(func_22(x), func_15('iqylus'))

Can you predict the output of `main_solution("ftezcpbp")` 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": "ftezcpbp"}, "ref_output": "f\u00abtie\u00bbz\u00abcqp\u00bbb\u00abpy\u00bb\u00abl\u00bb\u00abu\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_22(x), func_15('iqylus'))", "funcname": "main_solution"}
rule