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