a = [[0 for j in range(8)] for i in range(8)]
for i in range(8):
    s = input()
    for j in range(8):
        if s[j] == 'B':
            x = i, y = j
            while x >= 0 and y >= 0:
                a[x][y] = 1
                x -= 1, y -= 1
            x = i, y = j
            while x >= 0 and y < 8:
                a[x][y] = 1
                x -= 1, y += 1
            x = i, y = j
            while x < 8 and y < 8:
                a[x][y] = 1
                x += 1, y += 1
            x = i, y = j
            while x < 8 and y >= 0:
                a[x][y] = 1
                x += 1, y -= 1
        if s[j] == 'R':
            for k in range(8):
                a[i][k] = 1
                a[k][j] = 1
ans = 0
for i in range(8):
    for j in range(8):
        ans += 1 - a[i][j]
print(ans)