Problem:
Score : 300 points

Problem Statement

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.

Sample Input 1

3 3
.#.
..#
#..

Sample Output 1

10

Some of the pairs satisfying the condition are ((1, 2), (3, 3)) and ((3, 1), (3, 2)), where (i, j) denotes the square at the i-th row from the top and the j-th column from the left.

Sample Input 2

2 4
....
....

Sample Output 2

0

Sample Input 3

4 3
###
###
...
###

Sample Output 3

6

Solution in Ruby (2.3.3) (judge verdict: Accepted)

r=->i{P[i]?r[P[i]]:i};m=->i,j{B[i=r[i]]<B[j=r[j]]?m[j,i]:i!=j&&(P[j]=i;B[i]+=B[j];A[i]+=A[j])};eval"H,V="+gets.split*?,;S=$<.map(&:chop)*'';P=[];B=[];A=[];(H*V).times{|g|A[g]=1-B[g]=?.<=>c=S[g];g<V||c!=S[g-V]&&m[g,g-V];g%V>0&&c!=S[g-1]&&m[g,g-1]};a=0;(H*V).times{|g|P[g]||a+=A[g]*B[g]};p a