You are given a code:

def main_solution(x):
    return func_20(x, 'eay')

Can you predict the output of `main_solution("rsfblagv")` 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": "rsfblagv"}, "ref_output": "resafyblagv", "ref_code": "def main_solution(x):\n    return func_20(x, 'eay')", "funcname": "main_solution"}
rule