You are given a code:

def main_solution(x):
    return func_20(func_19('qpoym', 3), func_15('rrwvv'))

Can you predict the output of `main_solution("nvv")` 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": "nvv"}, "ref_output": "y\u00abmrq\u00bbp\u00abor\u00bb\u00abw\u00bb\u00abv\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19('qpoym', 3), func_15('rrwvv'))", "funcname": "main_solution"}
rule