You are given a code:

def main_solution(x):
    return func_20('hiikl', 'cal')

Can you predict the output of `main_solution("fkxsju")` 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": "fkxsju"}, "ref_output": "hciailkl", "ref_code": "def main_solution(x):\n    return func_20('hiikl', 'cal')", "funcname": "main_solution"}
rule