You are given a code:

def main_solution(x):
    return func_20('jlytku', 'ivbp')

Can you predict the output of `main_solution("wls")` 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": "wls"}, "ref_output": "jilvybtpku", "ref_code": "def main_solution(x):\n    return func_20('jlytku', 'ivbp')", "funcname": "main_solution"}
rule