import java.util.Scanner;

public class Main{
	public static void main(String args[]){

		//????????¨?¨???????????????????
		Scanner sc = new Scanner(System.in);
		while(true){
			int intH = sc.nextInt();
			int intW = sc.nextInt();
			int h = intH - 1;
			int w = intW - 1;

			//??????H???W???0?????£???????????????????????????
			if((intH == 0) && (intW == 0)){
				break;
			}
			//??????

			for (int i = 0; i < intH; i++) {
				String A = "";
				for (int j = 0; j < intW; j++) {
					if (i == 0 || i == h || j == 0 || j == w ) {
						A += "#";
					}else {
						A += ".";
					}
				}
				System.out.println(A);
			}
			System.out.println("");
		}
	}
}
/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