s = [list(map(int, input().split())) for i in range(8)]
for p in range(256):
    ans = True
    a = s[:][:]
    u = [0 for i in range(33)]
    for i in range(8):
        x = -1
        if (2 ** i) & p > 0:
            x = 1
        for j in range(8):
            if a[i][j] * x < 0:
                if u[abs(a[i][j])] == 0 and i < 7 and a[i+1][j] == -a[i][j]:
                    t = a[i+1][j]
                    a[i+1][j] = a[i][j]
                    a[i][j] = t
                else:
                    ans = False
            u[abs(a[i][j])] = 1
    if ans:
        print('YES')
        raise SystemExit(0)
print('NO')