#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N = 1505, d_row[] = {1, -1, 0, 0}, d_col[] = {0, 0, 1, -1};
int f_row, f_col, n, m, w, h;
int col_1, row_1, col_2, row_2;
int U[N][N], D[N][N], L[N][N], R[N][N];
char g[N][N];
bool vis[N][N];
void bfs() {
queue<pair<int, int>> q;
q.push({row_1, col_2});
vis[row_1][col_2] = true;
while (q.size()) {
auto [row, col] = q.front();
q.pop();
if (row == f_row and col == f_col) {
return;
}
for (int i = 0; i < 4; i++) {
int n_row = row + d_row[i], n_col = col + d_col[i];
if (g[n_row][n_col] == 'X' or
!(1 <= n_row and n_row <= n and 1 <= n_col and n_col <= m)) {
continue;
}
if (i < 2) { // roww
int l = max(L[row][col], L[n_row][n_col]);
int r = min(R[row][col], R[n_row][n_col]);
if (r - l - 1 >= h and !vis[n_row][n_col]) {
q.push({n_row, n_col});
vis[n_row][n_col] = true;
}
} else { // coll
int u = max(U[row][col], U[n_row][n_col]);
int d = min(D[row][col], D[n_row][n_col]);
if (d - u - 1 >= h and !vis[n_row][n_col]) {
q.push({n_row, n_col});
vis[n_row][n_col] = true;
}
}
}
}
}
void run() {
cin >> n >> m >> w >> h;
swap(n, m);
cin >> col_1 >> row_1 >> col_2 >> row_2;
col_1++, col_2++, row_1++, row_2++;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
cin >> g[i][j];
if (g[i][j] == '*') {
f_row = i;
f_col = j;
}
}
}
for (int i = 1; i <= n; i++) {
L[i][0] = 0;
R[i][m + 1] = m + 1;
}
for (int j = 1; j <= m; j++) {
U[0][j] = 0;
D[n + 1][j] = n + 1;
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
if (g[i][j] == 'X') {
U[i][j] = i;
L[i][j] = j;
continue;
}
U[i][j] = U[i - 1][j];
L[i][j] = L[i][j - 1];
}
}
for (int i = n; i >= 1; i--) {
for (int j = m; j >= 1; j--) {
if (g[i][j] == 'X') {
D[i][j] = i;
R[i][j] = j;
continue;
}
D[i][j] = D[i + 1][j];
R[i][j] = R[i][j + 1];
}
}
bfs();
cout << (vis[f_row][f_col] ? "YES" : "NO") << '\n';
}
signed main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
int t = 1;
while (t--) {
run();
}
}
