#include <iostream>
#include <queue>
#include <vector>
#include <algorithm>
using namespace std;
int n, m;
char mat[105][105];
int bfs(int si, int sj, int ei, int ej) {
  queue<int> q;
  q.push(si);
  q.push(sj);
  q.push(0);

  vector<vector<bool>> visited(n, vector<bool>(m, false));
  visited[si][sj] = true;
  int di[] = {-1, 1, 0, 0};
  int dj[] = {0, 0, -1, 1};
  while(!q.empty()) {
    int ci = q.front();
    q.pop();
    int cj = q.front();
    q.pop();
    int cekor = q.front();
    q.pop();

    if(ci == ei and cj == ej) {
      return cekor;
    }
    for(int i = 0; i < 4; i++) {
      int ti = ci + di[i];
      int tj = cj + dj[i];
      if(ti >= 0 and ti < n and tj >= 0 and tj < m and !visited[ti][tj] and mat[ti][tj] != '#'){
        q.push(ti);
        q.push(tj);
        q.push(cekor + 1);
        visited[ti][tj] = true;

      }
    }

  }
}
int main()
{
  cin >> n >> m;
  vector<pair<int, int>> drinks;
  int si = 0, sj = 0, bi = 0, bj = 0;
  for(int i = 0; i < n; i++) {
    for(int j = 0; j < m; j++) {
      cin >> mat[i][j];
      if(mat[i][j] == 'D') {
        drinks.push_back(make_pair(i, j));
      }
      if(mat[i][j] == 'S') {
        si = i;
        sj = j;
      }
      if(mat[i][j] == 'B') {
        bi = i;
        bj = j;
      }
    }
  }
  vector<int> permutacija;
  for(int i = 0; i < drinks.size(); i++) {
    permutacija.push_back(i);
  }
  int sz = permutacija.size();

  int res = 1000;
  do {
    int path = 0;
    for(int i = 0; i < permutacija.size(); i++) {
      if(i == 0) {
        path += bfs(si, sj, drinks[permutacija[i]].first, drinks[permutacija[i]].second);
      }
      else {
        path += bfs(drinks[permutacija[i]].first, drinks[permutacija[i]].second, drinks[permutacija[i - 1]].first, drinks[permutacija[i - 1]].second);
      }
    }
    path += bfs(drinks[permutacija[sz - 1]].first, drinks[permutacija[sz - 1]].second, bi, bj);
  res = min(res ,path);
  } while(next_permutation(permutacija.begin(), permutacija.end()));
  cout << res << endl;
    return 0;
}
 /*
CX..
C...

K = 2


 **/