You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'yej'), func_15('vfkjqv'))

Can you predict the output of `main_solution("rlbfjxevkw")` 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": "rlbfjxevkw"}, "ref_output": "y\u00abevj\u00bbr\u00ablfb\u00bbf\u00abjkx\u00bbe\u00abvjk\u00bbw\u00abq\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'yej'), func_15('vfkjqv'))", "funcname": "main_solution"}
rule