Codeforces Round #290 (Div. 2)A. Fox And Snake

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本文介绍了一个简单的编程任务：绘制一个蛇形图案。该图案在一个 n×m 的表格中呈现，从左上角开始，蛇身沿着特定路径延伸。文章提供了 C++ 代码实现，展示了如何用字符表示蛇身及空白部分。

Fox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so she decides to draw a snake instead.

A snake is a pattern on a n by m table. Denote c-th cell of r-th row as (r, c). The tail of the snake is located at (1, 1), then it's body extends to (1, m), then goes down 2 rows to (3, m), then goes left to (3, 1) and so on.

Your task is to draw this snake for Fox Ciel: the empty cells should be represented as dot characters ('.') and the snake cells should be filled with number signs ('#').

Consider sample tests in order to understand the snake pattern.

Input

The only line contains two integers: n and m (3 ≤ n, m ≤ 50).

n is an odd number.

Output

Output n lines. Each line should contain a string consisting of m characters. Do not output spaces.

Examples

input

Copy
3 3

output

Copy
###
..#
###

input

Copy
3 4

output

Copy
####
...#
####

input

Copy
5 3

output

Copy
###
..#
###
#..
###

#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int main()
{
	int n,m;
	while(cin>>n>>m)
	{
		for(int i=1;i<=n;i++)
		{
			if(i&1)
			{
				for(int j=0;j<m;j++)
					cout<<"#";
			}
			else
			{
				int k=i/2;
				if(k&1)
				{
					for(int i=1;i<m;i++)
						cout<<".";
					cout<<"#";
				}
				else
				{
					cout<<"#";
					for(int i=1;i<m;i++)
						cout<<".";
				}
			}
			cout<<endl;
		}
	}
	return 0;
}