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: Wrong Answer)

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

int main(int argc, char const *argv[]) {
  int n, m;
  scanf("%d", &n);
  scanf("%d", &m);
  char pica[n][n+1];
  char picb[m][m+1];

  for (int i = 0; i < n; i++) {
    scanf("%s\n", pica[i]);
  }
  for (int i = 0; i < m; i++) {
    scanf("%s\n", picb[i]);
  }

  for (int i = 0; i < n - m + 1; i++) {
    if (strstr(pica[i], picb[0]) != NULL) {
      char *pointa = strstr(pica[i], picb[0]);
      for (int j = 0; j < m; j++) {
        for(int k = 0; k < m; k++){
          if(pica[i + j][pica[i] - pointa + k] != picb[j][k])
            goto LABEL;
          if (j == m - 1){
            printf("Yes\n");
            return 0;
          }
        }
      }
    }
    LABEL: ;
  }
  printf("No\n");
  return 0;
}