a = []
for _ in range(3):
    a.append(list(input()))


dy = [-1, 0, 1, 0]
dx = [0, 1, 0, -1]

count = 0

for i in range(3):
    for j in range(3):
        count_0 = 0
        for k in range(4):
            if (i + dy[k] < 0 or 2 < i + dy[k] or j + dx[k] < 0 or 2 < j + dx[k]) or a[i + dy[k]][j + dx[k]] != a[i][j]:
                count_0 += 1
        
        if count_0 == 4:
            count += 1
            
if count == 9:
    print("Yes")
else:
    print("No")