using static System.Console;

​

public class Program {

    public static void Main() {

        Compara(20, 15);

        Compara(20, 14);

        Compara(20, 11);

        Compara(20, 8);

        Compara(20, 2);

    }

    private static void Compara(int aniversario, int ano) => WriteLine((aniversario - ano) switch {

            < 6 => "Infatil A",

            < 7 => "Infantil B",

            < 10 => "Juvenil A",

            < 13 => "Juvenil B",

            > 17 => "Adulto",

            _ =>  "Não existe categoria",

        });

}