#include <bits/stdc++.h>
using namespace std;

using VS = vector<string>;    using LL = long long;
using VI = vector<int>;       using VVI = vector<VI>;
using PII = pair<int, int>;   using PLL = pair<LL, LL>;
using VL = vector<LL>;        using VVL = vector<VL>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))
#define FOR(i, s, e) for (int(i) = (s); (i) < (e); (i)++)
#define FORR(i, s, e) for (int(i) = (s); (i) > (e); (i)--)
#define debug(x) cerr << #x << ": " << x << endl
const int INF = 1e9;                          const LL LINF = 1e16;
const LL MOD = 1000000007;                    const double PI = acos(-1.0);
int DX[8] = { 0, 0, 1, -1, 1, 1, -1, -1 };    int DY[8] = { 1, -1, 0, 0, 1, -1, 1, -1 };

/* -----  2018/10/02  Problem: yukicoder 323  / Link: http://yukicoder.me/problems/no/323  ----- */
/* ------問題------



-----問題ここまで----- */
/* -----解説等-----



----解説ここまで---- */

LL ans = 0LL;
bool d[3003][51][51];

int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);

	int H, W; cin >> H >> W;
	int A; PII s; cin >> A >> s.first >> s.second;
	int B; PII t; cin >> B >> t.first >> t.second;
	VS vs(H);
	FOR(i, 0, H) {
		cin >> vs[i];
	}

	const int Max = 3000;
	auto f = [&]() {

		using tp = tuple<int, int, int>;
		queue<tp>q;
		d[A][s.first][s.second] = 1;
		q.push(tp(A, s.first, s.second));
		while (!q.empty()) {
			int dist, y, x;
			tie(dist, y, x) = q.front(); q.pop();

#define IN(a,b,c) (a<=b&&b<c)
			FOR(k, 0, 4) {
				int ny = y + DY[k], nx = x + DX[k];
				if (IN(0, ny, H) && IN(0, nx, W)) {
					int c = (vs[ny][nx] == '*' ? 1 : -1);
					int nd = dist + c;
					if (nd > Max || nd < 0)continue;
					if (!d[nd][ny][nx]) {
						d[nd][ny][nx] = 1;
						q.push(tp(nd, ny, nx));
						if (nd == B && PII(ny, nx) == t) { return 1; }
					}
				}
			}

		}
		return 0;
	};
	ans = f();
	cout << (ans ? "Yes" : "No") << "\n";

	return 0;
}