You are given a code:

def main_solution(x):
    return func_20(func_19('mepwux', 1), func_15(x))

Can you predict the output of `main_solution("rklmmuyj")` 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": "rklmmuyj"}, "ref_output": "e\u00abprw\u00bbu\u00abxkm\u00bb\u00abl\u00bb\u00abm\u00bb\u00abm\u00bb\u00abu\u00bb\u00aby\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19('mepwux', 1), func_15(x))", "funcname": "main_solution"}
rule