import java.io.*;

public class Main{
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String line = br.readLine();
			String[] str = line.split(" ");
			int h = Integer.parseInt(str[0]);
			int w = Integer.parseInt(str[1]);
			if ( h == 0 && w == 0 ){ //??\????????¨??????0
				break;
			}

			for (int i = 0; i < h ; i++ ) {
				for (int k = 0; k < w ; k++ ) {
					if ( i == 0 || i == (h-1)) {
						System.out.print("#");
					}else{
						if ( k == 0 || k == (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