You are given a code:

def main_solution(x):
    return func_20('pqgl', 'yxjfxi')

Can you predict the output of `main_solution("ywwft")` 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": "ywwft"}, "ref_output": "pyqxgjlfxi", "ref_code": "def main_solution(x):\n    return func_20('pqgl', 'yxjfxi')", "funcname": "main_solution"}
rule