You are given a code:

def main_solution(x):
    return func_20('iehx', 'ktoqtl')

Can you predict the output of `main_solution("ltkz")` 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": "ltkz"}, "ref_output": "ikethoxqtl", "ref_code": "def main_solution(x):\n    return func_20('iehx', 'ktoqtl')", "funcname": "main_solution"}
rule