You are given a code:

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

Can you predict the output of `main_solution("ohpnnnydu")` 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": "ohpnnnydu"}, "ref_output": "o\u00abhop\u00bbn\u00abnhn\u00bby\u00abdpu\u00bbn\u00abanv\u00bbk\u00abenv\u00bb\u00abn\u00bb\u00aby\u00bb\u00abd\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'navkev'), func_15(x))", "funcname": "main_solution"}
rule