S = [input() for _ in range(3)]

a = 0 if S[0][0]=="#" else 1
flag = True
for i in range(3):
    for j in range(3):
        b = 0 if S[i][j]=="#" else 1
        if a != (b+i+j)%2:
            flag = False
            break
    if flag==False:
        break

print("Yes" if flag else "No")