import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			while (true) {
				String s = reader.readLine();
				String[] a = s.split(" ");
				
				int H = Integer.parseInt(a[0]);
				int W = Integer.parseInt(a[1]);
				
				if (H == 0 && W == 0) {
					break;
				}
				
				for (int i = 0; i < H; i++) {
					for (int j = 0; j < W; j++) {
						if ((i != 0 && i != (H - 1)) && (j != 0 && j != (W - 1))) {
							System.out.print(".");
						} else {
							System.out.print("#");
						}
					}
					System.out.println();
				}
				System.out.println();
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz