# coding: utf-8
def match(ofs_x, ofs_y, li_A, li_B):
    for a, b in zip(li_A[ofs_y:], li_B):
        if a[ofs_x:ofs_x + M] != b:
            return False
    return True

N, M = map(int, input().split())
li_A = [input() for _ in range(N)]
li_B = [input() for _ in range(M)]

for y in range(N-M+1):
    for x in range(N-M+1):
        if match(x, y, li_A, li_B):
            print("Yes")
            exit()
print("No")