#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;
int ok[51][51][3601];
int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};
int main(){
  int h, w, a, b;
  int sx, sy, gx, gy;
  cin >> h >> w;
  cin >> a >> sx >> sy;
  cin >> b >> gx >> gy;
  vector<string> s(h);
  rep(i,h) cin >> s[i];

  ok[sx][sy][a] = 1;
  queue<P> que;
  que.push(make_pair(sx*100+sy, a));
  
  while (!que.empty()) {
    auto p = que.front(); que.pop();

    rep(i, 4) {
      int x = p.first / 100 + dx[i];
      int y = p.first % 100 + dy[i];
      if (x < 0 || y < 0 || x >= h || y >= w) continue;
      int cost = p.second + (s[x][y] == '*' ? 1 : -1);
      if (cost <= 0 || cost > 3500) continue;
      if (ok[x][y][cost]) continue;
      ok[x][y][cost] = 1;
      que.push(make_pair(x*100+y, cost));
    }
  }
  if (ok[gx][gy][b]) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}