using System;
using System.Collections.Generic;
using System.Text;

class Class1 {
	static void Main(string[] args) {
		long tick = DateTime.Now.Ticks;
		bool[,] maze = new bool[int.Parse(args[0]) * 2 + 3, int.Parse(args[1]) * 2 + 3];
		for(int y = 0; y < maze.GetLength(1); y++) {
			for(int x = 0; x < maze.GetLength(0); x++) {
				maze[x, y] = x == 0 || y == 0 || x == maze.GetLength(0) - 1 || y == maze.GetLength(1) - 1;
			}
		}
		モグラﾀｿ mogura = new モグラﾀｿ(maze);
		string time = (DateTime.Now.Ticks - tick) / 10000L + "ms";
		mogura.Out(maze);
		Console.WriteLine("迷路生成のみ　" + time);
		Console.Write("出力こみ　" + ((DateTime.Now.Ticks - tick) / 10000L) + "ms");
		Console.ReadLine();
	}
}

class モグラﾀｿ {
	Random rnd = new Random();
	bool[,] _maze;
	Stack<int[]> line;
	public モグラﾀｿ(bool[,] maze) {
		_maze = maze;
		line = new Stack<int[]>(_maze.Length);
		Dig(2, 2);
	}

	private void Dig(int x_, int y_) {
		int x = x_, y = y_;
		while(true) {
			//Out(_maze, x, y);
			//System.Threading.Thread.Sleep(100);
			_maze[x, y] = true;
			List<int[]> direcList = new List<int[]>();
			if(!_maze[x, y - 2]) direcList.Add(new int[] { 0, -1 });
			if(!_maze[x - 2, y]) direcList.Add(new int[] { -1, 0 });
			if(!_maze[x, y + 2]) direcList.Add(new int[] { 0, 1 });
			if(!_maze[x + 2, y]) direcList.Add(new int[] { 1, 0 });
			int[] direc;
			if(direcList.Count == 0) {
				if(line.Count == 0) break; ;
				int[] back = line.Pop();
				x = back[0];
				y = back[1];
				continue;
			} else if(direcList.Count == 1) direc = direcList[0];
			else direc = direcList[rnd.Next(0, direcList.Count)];

			_maze[x + direc[0], y + direc[1]] = true;
			x += direc[0] * 2;
			y += direc[1] * 2;
			line.Push(new int[] { x, y });
		}
	}
	
	private void Out(bool[,] maze, int x_, int y_) {
		//Console.Clear();
		StringBuilder sb = new StringBuilder();
		for(int y = 1; y < maze.GetLength(1) - 1; y++) {
			for(int x = 1; x < maze.GetLength(0) - 1; x++) {
				if(x_ == x && y_ == y) { 
					sb.Append("●");
				} else {
					sb.Append(maze[x, y] ? "　" : "■");
				}
			}
			sb.AppendLine();
		}
		Console.WriteLine(sb);
	}
	public void Out(bool[,] maze) {
		Out(maze, -1, -1);
	}
}