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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include <string>
//#include <conio.h>
using namespace std;
int main() {
	
	int n = 0;
	int m = 0;
	cin >> n >> m;
	string *strA = new string[n];
	string *strB = new string[m];
	for (int i = 0; i < n; i++) {
		cin >> strA[i];
	}
	for (int i = 0; i < m; i++) {
		cin >> strB[i];
	}
	int line = 0;
	int column = 0;
	bool calc(string *strA, string *strB,int n , int m, int diff, int line, int column);
	bool isIncludeA = false; 
	if (n < m) goto Last;
	isIncludeA = calc(strA, strB,n, m, n-m, line,column);
	Last:
	if (isIncludeA) cout << "Yes";
	else cout << "No";
	//line 縦,column 横
	//_getch();
}
bool calc(string *strA, string *strB, int n, int m, int diff, int line, int column) {
	for (int i = 0; i < m; i++) {
		if (strA[i + line].substr(column, m) == strB[i]) {
			
			//cout << strA[i + line].substr(column, m) << " " << i << endl;
			if (i == m - 1) {
				return true;
			}
			else { 
				continue;
			}
		}
		else {
			if (diff > column)	column++;
			else
			{
				if (line > column) {
					line++;
					column = 0;
				}
				else return false;
			}
			calc(strA, strB, n, m, diff, line, column);
		}
	}
	return false;

}