Problem:
Score : 200 points

Problem Statement

You are given an image A composed of N rows and N columns of pixels, and a template image B composed of M rows and M columns of pixels.

A pixel is the smallest element of an image, and in this problem it is a square of size 1×1.

Also, the given images are binary images, and the color of each pixel is either white or black.

In the input, every pixel is represented by a character: . corresponds to a white pixel, and # corresponds to a black pixel.

The image A is given as N strings A_1,...,A_N.

The j-th character in the string A_i corresponds to the pixel at the i-th row and j-th column of the image A (1≦i,j≦N).

Similarly, the template image B is given as M strings B_1,...,B_M.

The j-th character in the string B_i corresponds to the pixel at the i-th row and j-th column of the template image B (1≦i,j≦M).

Determine whether the template image B is contained in the image A when only parallel shifts can be applied to the images.

Constraints

1≦M≦N≦50

A_i is a string of length N consisting of # and ..

B_i is a string of length M consisting of # and ..

Input

The input is given from Standard Input in the following format:

N M
A_1
A_2
:
A_N
B_1
B_2
:
B_M

Output

Print Yes if the template image B is contained in the image A. Print No otherwise.

Sample Input 1

3 2
#.#
.#.
#.#
#.
.#

Sample Output 1

Yes

The template image B is identical to the upper-left 2 × 2 subimage and the lower-right 2 × 2 subimage of A. Thus, the output should be Yes.

Sample Input 2

4 1
....
....
....
....
#

Sample Output 2

No

The template image B, composed of a black pixel, is not contained in the image A composed of white pixels.

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>

int main(void)
{
	int n = 0, m = 0,flag = 0,check = 0;
	char N[60][60], M[60][60],dummy;
	scanf("%d%d",&n, &m);
	scanf("%c", &dummy);
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			scanf("%c", &N[i][j]);
		}
		scanf("%c", &dummy);
	}
	for (int i = 0; i < m; i++)
	{
		for (int j = 0; j < m; j++)
		{
			scanf("%c", &M[i][j]);
		}
		scanf("%c", &dummy);
	}

	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			if (i + m - 1 >= n || j + m - 1 >= n)
			{
				continue;
			}
			
			check = 0;

			for (int y = 0; y < m; y++)
			{
				for (int x = 0; x < m; x++)
				{
					if (N[i + y][j + x] != M[y][x])
					{
						check = 1;
					}
				}
			}
			if (check == 0) { flag = 1; }
		}
	}
	
	if (flag == 1) { printf("Yes"); }
	else { printf("No"); }

	return 0;
}