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# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        string line = System.Console.ReadLine().Trim();

        string[] Data = line.Split(' ');
        int N = int.Parse(Data[0]);
        int M = int.Parse(Data[1]);

        List<string> data = new List<string>();


        for (int i = 0; i < N; i++)
        {
             line = System.Console.ReadLine().Trim();
             data.Add(line);
        }

        for (int i = 0; i < M; i++)
        {
            line = System.Console.ReadLine().Trim();

            bool flag = false;

            for(int j = 0; j < N; j++)
            {
                int index = data[j].IndexOf(line);

                if(index != -1)
                {
                    flag = true;
                }
            }
            
            
            if(flag)
            {
              System.Console.WriteLine("Yes");
            }
            else
            {
                System.Console.WriteLine("No");
            }
        }     
    }
}