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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		boolean[][] A = new boolean[N][N];
		boolean[][] B = new boolean[M][M];
		for(int i = 0;i < N;++i) {
			String s = sc.next();
			for(int j = 0;j < N;++j) {
				A[j][i] = s.charAt(j) == '.' ? true : false;
			}
		}
		for(int i = 0;i < M;++i) {
			String s = sc.next();
			for(int j = 0;j < M;++j) {
				B[j][i] = s.charAt(j) == '.' ? true : false;
			}
		}
		sc.close();
		
		boolean ans = false;
		for(int ax = 0;ax < N-M;++ax) {
			for(int ay = 0;ay < N-M;++ay) {
				boolean flag = true;
				for(int bx = 0;bx < M;++bx) {
					for(int by = 0;by < M;++by) {
						if(A[ax+bx][ay+by] != B[bx][by]) {
							flag = false;
							break;
						}
					}
					if(!flag)break;
				}
				if(flag) {
					ans = true;
					break;
				}
			}
			if(ans)break;
		}
		if(ans)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
}