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)

#include <stdio.h>

int main(void){

  int n,m;
  scanf("%d %d", &n, &m);
  char a[n][n+1];
  char b[m][m+1];
  for (int i = 0; i < n; i++) {
    scanf("%s", a[i]);
  }
  for (int i = 0; i < m; i++) {
    scanf("%s", b[i]);
  }

  int match = 0;
  int flag;
  for (int i = 0; i < n-m+1; i++) {
    for (int j = 0; j < n-m+1; j++) {
      flag = 0;
      for (int row = 0; row < m; row++) {
        for (int column = 0; column < m; column++) {
          if (a[i+row][j+column] != b[row][column]) {
            flag = 1;
            break;
          }
        }
        if (flag == 1) {
          break;
        }
      }
      if (flag == 0) {
        match = 1;
      }
      if (match == 1) {
        break;
      }
    }
    if (match == 1) {
      break;
    }
  }
  if (match == 1) {
    printf("Yes\n");
  } else {
    printf("No\n");
  }

  return 0;
}