import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;
public class D {
final static A.FastReader reader = new A.FastReader();
final static PrintWriter writer = new PrintWriter(new OutputStreamWriter(System.out));
public static void main(String[] args) {
System.out.println(0 % 2);
int n = reader.nextInt();
int m = reader.nextInt();
char[][] grid = new char[n][m];
for (int i = 0; i < n; i++) {
Arrays.fill(grid[i], '.');
}
if (n != 1) {
outer:
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (n == 2) {
if (i == 0 && j % 2 == 0) {
grid[i][j] = '#';
}
}
if (n == 3) {
if ((i == 0 || i == n - 1) && j % 2 == 0) {
grid[i][j] = '#';
}
}
if (n == 4) {
if (m % 2 == 0) {
System.out.println("n = " + n + " j = " + j);
if (i == 0 && j == m - 1) {
grid[i][j] = '#';
} else if (i != 0 && i % 2 == 1 && j % 2 == 0) {
grid[i][j] = '#';
}
} else {
if (i != 0 && i % 2 == 1 && j % 2 == 0) {
grid[i][j] = '#';
}
}
}
}
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
writer.write(grid[i][j]);
}
writer.println();
}
writer.flush();
writer.close();
}
static void draw(char[][] grid, int x, int y) {
boolean wall = false;
if (grid[x + 1][y] == '#') {
if (x == 0 && y == 0) {
grid[x][y] = '.';
}
}
}
static class Pair {
int x;
int y;
public Pair(int x, int y) {
}
}
static class FastReader {
BufferedReader reader;
StringTokenizer tokenizer;
public FastReader() {
this.reader = new BufferedReader(new InputStreamReader(System.in));
this.tokenizer = null;
}
String next() {
while (tokenizer == null || !tokenizer.hasMoreElements()) {
try {
tokenizer = new StringTokenizer(reader.readLine());
} catch (Exception e) {
}
}
return tokenizer.nextToken();
}
String nextLine() {
try {
return reader.readLine();
} catch (IOException ex) {
}
return null;
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
BigInteger nextBigInt() {
return new BigInteger(next());
}
void close() {
try {
reader.close();
} catch (IOException ex) {
Logger.getLogger(A.class.getName()).log(Level.SEVERE, null, ex);
}
reader = null;
tokenizer = null;
}
}
}
