You are given a code:

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

Can you predict the output of `main_solution("okjtgow")` 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": "okjtgow"}, "ref_output": "\u00abock\u00bbj\u00abtzg\u00bbo\u00abweo\u00bbk\u00abjft\u00bbg\u00abohw\u00bbo\u00abkjj\u00bbtgowokjtgow", "ref_code": "def main_solution(x):\n    return func_20(func_15('czefhj'), func_1(x, 4))", "funcname": "main_solution"}
rule