s = input()
s += input()
s += input()
flag = True
if s[0] == "#":
    p = "."
for i in range(len(s)):
    if i%2 == 0:
        if s[i] != s[0]:
            flag = False
    else:
        if s[i] != p:
            flag = False

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