You are given a code:

def main_solution(x):
    return func_20((x + 'ymx'), func_15('udwl'))

Can you predict the output of `main_solution("xncu")` 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": "xncu"}, "ref_output": "x\u00abnuc\u00bbu\u00abydm\u00bbx\u00abw\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'ymx'), func_15('udwl'))", "funcname": "main_solution"}
rule