You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_1('xixbw', 4))

Can you predict the output of `main_solution("wpcrxbdj")` 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": "wpcrxbdj"}, "ref_output": "\u00abxwi\u00bbx\u00abbpw\u00bbx\u00abicx\u00bbb\u00abwrx\u00bbi\u00abxxb\u00bbw\u00abxbi\u00bbx\u00abbdw\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('xixbw', 4))", "funcname": "main_solution"}
rule