Square Frame

import java.util.Scanner;

public class SquareFrame {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        // First row
            System.out.print("+");
            for (int symbol = 0; symbol < n -2  ; symbol++) {
                System.out.print(" -");

            }
            System.out.print(" +");

            // Middle part
        System.out.println();
        for (int row = 0; row < n -2  ; row++) {
            System.out.print("|");
            for (int symbol = 0; symbol < n -2  ; symbol++) {
                System.out.print(" -");
        }
            System.out.println(" |");

        }
        System.out.print("+");
        for (int symbol = 0; symbol < n -2  ; symbol++) {
            System.out.print(" -");

        }
        System.out.print(" +");
    }
}