import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        while(true){
            String str[] = br.readLine().split(" ");
            int H = Integer.parseInt(str[0]);
            int W = Integer.parseInt(str[1]);
            if(H==0 && W==0) break;
            for(int i=0;i<H;i++){
                for(int j=0;j<W;j++){
                    if(i==0 || i==H-1){
                        sb.append("#");
                    }else{
                        if(0<j && j<W-1){
                            sb.append(".");
                        }else{
                            sb.append("#");
                        }
                    }
                }
                sb.append("\n");
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
}
/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