You are given a code:

def main_solution(x):
    return func_20(func_4(x), func_15('yhxta'))

Can you predict the output of `main_solution("eukycatwu")` 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": "eukycatwu"}, "ref_output": "e\u00abuyk\u00bby\u00abcha\u00bbt\u00abwxu\u00bb\u00abt\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_4(x), func_15('yhxta'))", "funcname": "main_solution"}
rule