#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using vi = vector<i64>;
using vvi = vector<vi>;

vvi board;

int main() {
    int h, w;
    cin >> h >> w;
    int a, si, sj, b, gi, gj;
    cin >> a >> si >> sj >> b >> gi >> gj;

    board = vvi(h, vi(w));
    for (int i = 0; i < h; i++) {
        string s;
        cin >> s;
        for (int j = 0; j < w; j++) {
            board[i][j] = s[j] == '*';
        }
    }

    vector<vvi> dp(1200, vvi(h, vi(w, 1e9)));
    using ii = pair<int, int>;
    using iii = pair<ii, int>;

    queue<iii> que;
    dp[a][si][sj] = 0;
    que.push(iii(ii(si, sj), a));

    int dx[] = {-1, 1, 0, 0};
    int dy[] = {0, 0, -1, 1};

    auto ok = [&](int x, int y) {
        return 0 <= x && x < h && 0 <= y && y < w;
    };

    while (que.size()) {
        iii t = que.front();
        que.pop();
        for (int i = 0; i < 4; i++) {
            int x = t.first.first + dx[i];
            int y = t.first.second + dy[i];
            if (ok(x, y)) {
                int sz = t.second + (board[x][y] ? 1 : -1);
                if (sz <= 0 || sz >= 1200) continue;
                if (dp[t.second][t.first.first][t.first.second] + 1 < dp[sz][x][y]) {
                    dp[sz][x][y] = dp[t.second][t.first.first][t.first.second] + 1;
                    que.push(iii(ii(x, y), sz));
                }
            }
        }
    }

    cout << (dp[b][gi][gj] == 1e9 ? "No" : "Yes") << endl;
}