You are given a code:

def main_solution(x):
    return (func_20('piioe', 'xik') + func_15('ubnice'))

Can you predict the output of `main_solution("wupwydvy")` 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": "wupwydvy"}, "ref_output": "pxiiikoe\u00abu\u00bb\u00abb\u00bb\u00abn\u00bb\u00abi\u00bb\u00abc\u00bb\u00abe\u00bb", "ref_code": "def main_solution(x):\n    return (func_20('piioe', 'xik') + func_15('ubnice'))", "funcname": "main_solution"}
rule