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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;

public class Main {

    public static void main(String args[]) {

        // 入力
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());
        int m = Integer.parseInt(sc.next());
        String[] a = new String[n];
        String[] b = new String[m];
        Arrays.setAll(a, i -> sc.next());
        Arrays.setAll(b, i -> sc.next());
        sc.close();

        // 主処理
        boolean judge = false;
        for (int i = 0; i <= n - m; i++) {
            int startIndex = 0;
            int index = a[i].indexOf(b[0], startIndex);
            while (0 <= index && index <= n - m) {
                boolean isSame = true;
                for (int j = 1; j < m; j++) {
                    if (index != a[i + j].indexOf(b[j], startIndex)) {
                        isSame = false;
                        break;
                    }
                }
                if (isSame) {
                    judge = true;
                    break;
                } else if (index < n - 1) {
                    startIndex = index + 1;
                    index = a[i].indexOf(b[0], startIndex);
                }
            }
        }
        String result = judge ? "Yes" : "No";

        // 出力
        System.out.println(result);
    }
}