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 Ruby (2.3.3) (judge verdict: Accepted)

def solve(a,b,n,m)
	ans=false
	for i in 0..n-m
		for j in 0..n-m
			same=true
			for k in 0..m-1
				for l in 0..m-1
					if a[i+k][j+l]!=b[k][l]
						same=false
					end
				end
			end
			if same==true then ans=true end
		end
	end
	puts ans==true ? "Yes" : "No" 
end

if __FILE__==$0
	rl_i=lambda{|str,dl|str.strip.split(dl).map(&:to_i)}
	r_s=lambda{|str|str.strip}
	dl=" "
	n=rl_i[gets,dl]
	a=[]
	b=[]
	n[0].times do |i|
		a.push(r_s[gets])
	end
	n[1].times do |i|
		b.push(r_s[gets])
	end
	solve(a,b,n[0],n[1])
end