import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\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