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 PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php
list($n, $m) = explode(" ", trim(fgets(STDIN)));
for($i = 0; $i < $n; $i++){
    $line = trim(fgets(STDIN));
    for($j = 0; $j < $n; $j++){
        $map[$i][$j] = $line[$j];
    }
}
for($i = 0; $i < $m; $i++){
    $line = trim(fgets(STDIN));
    for($j = 0; $j < $m; $j++){
        $map2[$i][$j] = $line[$j];
    }
}
for($X = 0; $X < $n - $m; $X++){
    for($Y = 0; $Y < $n - $m; $Y++){
        $flag = true;
        for($x = 0; $x < $m; $x++){
            for($y = 0; $y < $m; $y++){
                if($map[$X+$x][$Y+$y] != $map2[$x][$y]){
                    $flag = false;
                }
            }            
        }
        if($flag == true){
            echo "Yes";exit;
        }
    }
}
echo "No";