You are given a code:

def main_solution(x):
    return func_20(('slbzt' + 'vky'), func_15('bis'))

Can you predict the output of `main_solution("ekeaztm")` 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": "ekeaztm"}, "ref_output": "s\u00ablbb\u00bbz\u00abtiv\u00bbk\u00abys\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('slbzt' + 'vky'), func_15('bis'))", "funcname": "main_solution"}
rule