import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		while(true){
			int H=sc.nextInt();
			int W=sc.nextInt();
			
			if(H==0&&W==0) {
				break;
			}
			//最初の描画
			for(int i=0; i<W; i++) {
				System.out.printf("#");
			}
			System.out.printf("%n");
			
			//真ん中の描画
			for(int i=0; i<H-2; i++) {
				System.out.printf("#");
				
				for(int j=0; j<W-2; j++) {
					System.out.printf(".");
				}
				System.out.printf("#%n");
			}
			
			//最後の描画
			for(int i=0; i<W; i++) {
				System.out.printf("#");
			}
			System.out.printf("%n%n");
		}
	}

}


/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