S = []
for _ in range(3):
    tmp = list(map(lambda x:x == '#',list(input())))
    S.append(tmp)
for h in range(3):
    for w in range(3):
        if (h+w) % 2 == 0:
            if S[h][w] == S[0][0]:
                pass
            else:
                print('No')
                exit()
        else:
            if S[h][w] != S[0][0]:
                pass
            else:
                print('No')
                exit()
print('Yes')