You are given a code:

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

Can you predict the output of `main_solution("wrctrkjllu")` 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": "wrctrkjllu"}, "ref_output": "y\u00abnwi\u00bbz\u00abery\u00bbn\u00abicz\u00bbe\u00abytn\u00bbi\u00abzre\u00bby\u00abnki\u00bbz\u00abej\u00bb\u00abl\u00bb\u00abl\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_1('ynize', 4), func_15(x))", "funcname": "main_solution"}
rule