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 Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    let scan = std::io::stdin();
    let mut line = String::new();
    let _ = scan.read_line(&mut line);
    let v: Vec<&str> = line.split_whitespace().collect();
    let n: usize = v[0].parse().unwrap();
    let m: usize = v[1].parse().unwrap();
    
    let mut A = vec![vec!['\n']; n];
    for i in 0..n {
        let mut line = String::new();
        let _ = scan.read_line(&mut line);
        A[i] = line.chars().collect();
    }
    let mut B = vec![vec!['\n']; m];
    for i in 0..m {
        let mut line = String::new();
        let _ = scan.read_line(&mut line);
        B[i] = line.chars().collect();
    }
    
    let mut ok = false;
    'outer: for i in 0..(n - m + 1) {
        for j in 0..(n - m + 1) {
            let mut same = true;
            'inner: for r in 0..m {
                for c in 0..m {
                    if A[i + r][j + c] != B[r][c] {
                        same = false;
                        break 'inner;
                    }
                }
            }
            if same {
                ok = true;
                break 'outer;
            }
        }
    }
    println!("{}", if ok {"Yes"} else {"No"});
}