#include <bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(0);cin.tie(0)
typedef long long ll;
#define f first
#define s second
#define LOGN 21
const ll MOD = 1e9 + 7;
const ll MAXN = 1600;
int W, H, hor, ver, ver_check[MAXN][MAXN], hor_check[MAXN][MAXN];
int ver_col, ver_row, hor_col, hor_row, hor_all[MAXN][MAXN], ver_all[MAXN][MAXN];
int pref[MAXN][MAXN], pref2[MAXN][MAXN], vis[MAXN][MAXN];
string grid[MAXN];
bool check(int r1, int c1, int r2, int c2) {
if (r1 > H || r2 > H || c1 > W || c2 > W || r1 < 1 || r2 < 1 || c1 < 1 || c2 < 1)
return false;
if (r1 == r2 && pref[r1][c1-1] == pref[r1][c2])
return true;
if (c1 == c2 && pref2[r2][c1] == pref2[r1-1][c1])
return true;
return false;
}
void vertical(int R, int C) {
int dr[] = {-1, 0, 1, 0};
int dc[] = {0, 1, 0, -1};
for (int i = 0; i < 4; i++) {
int nr = R + dr[i];
int nc = C + dc[i];
if (nr > H || nr < 1 || nc > W || nc < 1)
continue;
if (check(nr, nc, nr + ver - 1, nc) && !ver_check[nr][nc]) {
ver_check[nr][nc] = true;
vertical(nr, nc);
}
}
}
void horizontal(int R, int C) {
int dr[] = {-1, 0, 1, 0};
int dc[] = {0, 1, 0, -1};
for (int i = 0; i < 4; i++) {
int nr = R + dr[i];
int nc = C + dc[i];
if (nr > H || nr < 1 || nc > W || nc < 1)
continue;
if (check(nr, nc, nr, nc + hor - 1) && !hor_check[nr][nc]) {
hor_check[nr][nc] = true;
horizontal(nr, nc);
}
}
}
bool result(int row, int col) {
if (grid[row][col] == '*')
return true;
if (vis[row][col])
return false;
vis[row][col] = true;
int dr[] = {-1, 0, 1, 0};
int dc[] = {0, 1, 0, -1};
bool ans = false;
for (int i = 0; i < 4; i++) {
int nr = row + dr[i];
int nc = col + dc[i];
if (nr > H || nr < 1 || nc > W || nc < 1)
continue;
if (hor_all[nr][nc] && ver_all[nr][nc])
ans |= result(nr, nc);
}
return ans;
}
int main() {
fast;
cin >> W >> H >> hor >> ver;
cin >> ver_col >> ver_row >> hor_col >> hor_row;
ver_col++; ver_row++; hor_col++; hor_row++;
for (int i = 1; i <= H; i++) {
cin >> grid[i];
grid[i] = "#" + grid[i];
}
for (int i = 1; i <= H; i++) {
for (int j = 1; j <= W; j++)
pref[i][j] = pref[i][j-1] + (grid[i][j] == 'X');
}
for (int i = 1; i <= W; i++) {
for (int j = 1; j <= H; j++)
pref2[j][i] = pref2[j-1][i] + (grid[j][i] == 'X');
}
vertical(ver_row, ver_col);
horizontal(hor_row, hor_col);
for (int i = 1; i <= H; i++) {
for (int j = 1; j <= W; j++) {
if (hor_check[i][j]) {
hor_all[i][j]++;
if (j + hor - 1 <= 1550)
hor_all[i][j + hor]--;
}
}
}
for (int j = 1; j <= W; j++) {
for (int i = 1; i <= H; i++) {
if (ver_check[i][j]) {
ver_all[i][j]++;
if (i + ver - 1 <= 1550)
ver_all[i + ver][j]--;
}
}
}
for (int i = 1; i <= H; i++) {
for (int j = 1; j <= W; j++)
hor_all[i][j] += hor_all[i][j-1];
}
for (int j = 1; j <= W; j++) {
for (int i = 1; i <= H; i++)
ver_all[i][j] += ver_all[i-1][j];
}
if (result(hor_row, ver_col))
cout << "YES\n";
else
cout << "NO\n";
}
