You are given a code:

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

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