You are given a code:

def main_solution(x):
    return func_19('oxsflc', 1)

Can you predict the output of `main_solution("keyzsdtpwj")` 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": "keyzsdtpwj"}, "ref_output": "xsflco", "ref_code": "def main_solution(x):\n    return func_19('oxsflc', 1)", "funcname": "main_solution"}
rule