import java.util.*;

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;
			}else{
				for(int i=0;i<W;i++){
					System.out.print("#");
				}
				System.out.println();
				for(int i=1;i<H-1;i++){
					System.out.print("#");
					for(int j=1;j<W-1;j++){
						System.out.print(".");
					}
					System.out.println("#");
				}
				for(int i=0;i<W;i++){
					System.out.print("#");
				}
				System.out.println();
				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