s = [[] for i in range(3)]
for i in range(3):
    s[i] = list(input())
d = 0
for i in range(3):
    for j in range(2):
        if i != 2:
            if s[i][j] != s[i+1][j] and s[i][j] != s[i][j+1]:
                d += 1
        else:
            if s[i][j] != s[i][j+1]:
                d += 1
if d == 6:
    print("Yes")
else:
    print("No")