You are given a code:

def main_solution(x):
    return func_20(('nvo' + 'zstcew'), func_15('kko'))

Can you predict the output of `main_solution("yeuhxap")` 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": "yeuhxap"}, "ref_output": "n\u00abvko\u00bbz\u00abskt\u00bbc\u00abeow\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('nvo' + 'zstcew'), func_15('kko'))", "funcname": "main_solution"}
rule