You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_15('edtmop'))

Can you predict the output of `main_solution("byjdspjkxf")` 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": "byjdspjkxf"}, "ref_output": "\u00ab\u00abbe\u00bb\u00bb\u00ab\u00abyd\u00bb\u00bb\u00ab\u00abjt\u00bb\u00bb\u00ab\u00abdm\u00bb\u00bb\u00ab\u00abso\u00bb\u00bb\u00ab\u00abpp\u00bb\u00bb\u00abj\u00bb\u00abk\u00bb\u00abx\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_15('edtmop'))", "funcname": "main_solution"}
rule