#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif
#define int long long
#define all(x) (x).begin(), (x).end()
#define isz(x) (int)x.size()
const int sz = 2000;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
char g[sz][sz];
bool used[sz][sz];
array<int, 4> nearest[sz][sz];
int pre_y[sz], pre_x[sz];
void run(int tc) {
int n, m, k, l, xv, yv, xh, yh;
cin >> n >> m >> k >> l >> xh >> yh >> xv >> yv;
xh++, yh++, xv++, yv++;
array<int, 2> target, start{yh, xv}; // y, x
for (int i = 1; i <= m; i++) {
for (int j = 1; j <= n; j++) {
cin >> g[i][j];
if (g[i][j] == '*') {
target = {i, j};
}
}
}
for (int i = 1; i <= m; i++) {
for (int j = 1; j <= n; j++) {
pre_x[i] = pre_x[i - 1] + (g[i][j] == 'X');
}
}
for (int j = 1; j <= n; j++) {
for (int i = 1; i <= m; i++) {
pre_y[j] = pre_y[j - 1] + (g[i][j] == 'X');
}
}
for (int i = 1; i <= m; i++) {
for (int j = 1; j <= n; j++) {
if (g[i][j] == 'X') {
nearest[i][j] = {i, i, j, j};
continue;
}
auto it = upper_bound(pre_x + i, pre_x + 1 + m, pre_x[i]) - pre_x;
nearest[i][j][0] = it;
it = lower_bound(pre_x, pre_x + i, pre_x[i]) - pre_x;
nearest[i][j][1] = it;
it = lower_bound(pre_y, pre_y + j, pre_y[j]) - pre_y;
nearest[i][j][2] = it;
it = upper_bound(pre_y + j, pre_y + 1 + n, pre_y[j]) - pre_y;
nearest[i][j][3] = it;
}
}
used[start[0]][start[1]] = true;
queue<array<int, 2>> q;
q.push(start);
while (!q.empty()) {
auto [y, x] = q.front();
if (q.front() == target) break;
q.pop();
debug(y, x);
for (int i = 0; i < 4; i++) {
int ny = dy[i] + y;
int nx = dx[i] + x;
if (g[ny][nx] == 'X') continue;
if (i == 0 || i == 1) {
int len = nearest[ny][nx][0] - nearest[ny][nx][1];
debug(len, "2");
if (len >= l && !used[ny][nx]) {
used[ny][nx] = true;
q.push({ny, nx});
}
} else {
int len = nearest[ny][nx][3] - nearest[ny][nx][2];
debug(len, "1");
if (len >= k && !used[ny][nx]) {
used[ny][nx] = true;
q.push({ny, nx});
}
}
}
}
cout << (used[target[0]][target[1]] ? "YES" : "NO") << '\n';
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t = 1; // cin >> t;
for (int tc = 1; tc <= t; tc++) run(tc);
}
