Problem: There is a grid with H rows and W columns, where each square is painted black or white.

You are given H strings S_1, S_2, ..., S_H, each of length W. If the square at the i-th row from the top and the j-th column from the left is painted black, the j-th character in the string S_i is `#`; if that square is painted white, the j-th character in the string S_i is `.`.

Find the number of pairs of a black square c_1 and a white square c_2 that satisfy the following condition:

* There is a path from the square c_1 to the square c_2 where we repeatedly move to a vertically or horizontally adjacent square through an alternating sequence of black and white squares: black, white, black, white...

Constraints

* 1 \leq H, W \leq 400
* |S_i| = W (1 \leq i \leq H)
* For each i (1 \leq i \leq H), the string S_i consists of characters `#` and `.`.

Input

Input is given from Standard Input in the following format:


H W
S_1
S_2
:
S_H


Output

Print the answer.

Examples

Input

3 3
.#.
..#
#..


Output

10


Input

3 3
.#.
..#
..


Output

10


Input

2 4
....
....


Output

0


Input

4 3


...


Output

6

Solution (in PYTHON3):

Solution:
import collections
import sys
sys.setrecursionlimit(1000000)


H, W = map(int, input().split())
S = [list(input()) for _ in range(H)]


seen = [[False] * W for i in range(H)]
move = ((-1, 0), (1, 0), (0, -1), (0, 1))

q = collections.deque()


def bfs(i, j):
    b, w = 0, 0
    seen[i][j] = True
    q.append((i, j))

    while q:
        ci, cj = q.popleft()

        if S[ci][cj] == '#':
            b += 1
        else:
            w += 1

        for di, dj in move:
            ni = ci+di
            nj = cj+dj
            if 0 <= ni < H and 0 <= nj < W:
                if seen[ni][nj] is False and S[ci][cj] != S[ni][nj]:
                    seen[ni][nj] = True
                    q.append((ni, nj))

    return b*w


ans = 0
for i in range(H):
    for j in range(W):
        if S[i][j] == '#' and seen[i][j] is False:
            ans += bfs(i, j)

print(ans)