import java.util.Scanner;

public class Main {

    static int n,m;

    static char[][] field;

    static void dfs(int row, int col){

        field[row][col] = '@';

        for(int dx = -1; dx <= 1; dx++){

            for(int dy = -1; dy <= 1; dy++){

                int newRow = row + dx;

                int newCol = col + dy;

                if(newRow >= 0 && newRow < n && newCol >=0 && newCol < m && field[newRow][newCol]=='W'){

                    dfs(newRow,newCol);

                }

            }

        }    

    }

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        n = in.nextInt();

        m = in.nextInt();

        field = new char[n][m];

        for(int i = 0; i < n; i++){

            for(int j = 0; j < m; j++)

              field[i][j] = in.next().charAt(0);

        }

        int ans = 0;

        for(int i = 0; i < n; i++){

            for(int j = 0; j < m; j++){

                if(field[i][j]=='W'){

                    dfs(i,j);

                    ans++;

                }

            }

        }

        System.out.println(ans);

    }

}