You are given a code:

def main_solution(x):
    return func_20(func_17(x), func_15('cptfqm'))

Can you predict the output of `main_solution("nesvvin")` 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": "nesvvin"}, "ref_output": "n\u00abicv\u00bbv\u00abspe\u00bbn\u00abt\u00bb\u00abf\u00bb\u00abq\u00bb\u00abm\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_17(x), func_15('cptfqm'))", "funcname": "main_solution"}
rule