// Mahmud Isali
#pragma oprimize ("O3")
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
// using namespace __gnu_pbds;
#define int long long
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define pb push_back
#define F first
#define S second
// #define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
const long long INF = 1e18, MOD = 1e9 + 7, N = 1500 + 10;
int W,H,K,L,xh,yh,xv,yv;
bool used[N][N];
char v[N][N];
int up[N][N], dw[N][N], lf[N][N], rg[N][N];
void dfs(int x, int y) {
if(x < 1 || x > H || y < 1 || y > W || used[x][y]) return; used[x][y] = true;
if(x > 1) {
int Lf = max(lf[x][y], lf[x-1][y]);
int Rg = min(rg[x][y], rg[x-1][y]);
if(Rg - Lf + 1 >= K)
dfs(x-1, y);
}
if(x < H) {
int Lf = max(lf[x][y], lf[x+1][y]);
int Rg = min(rg[x][y], rg[x+1][y]);
if(Rg - Lf + 1 >= K)
dfs(x+1, y);
}
if(y > 1) {
int Up = max(up[x][y], up[x][y-1]);
int Dw = min(dw[x][y], dw[x][y-1]);
if(Dw - Up + 1 >= L)
dfs(x, y-1);
}
if(y < W) {
int Up = max(up[x][y], up[x][y+1]);
int Dw = min(dw[x][y], dw[x][y+1]);
if(Dw - Up + 1 >= L)
dfs(x, y+1);
}
}
void prep() {
for(int i = 1; i <= H; i++) {
int lft = 0, rgh = W + 1;
for(int j = 1; j <= W; j++) {
if(v[i][j] == 'X') lft = j;
lf[i][j] = lft;
}
for(int j = W; j >= 1; j--) {
if(v[i][j] == 'X') rgh = j;
rg[i][j] = rgh;
}
}
for(int i = 1; i <= W; i++) {
int upp = 0, dwn = H + 1;
for(int j = 1; j <= H; j++) {
if(v[j][i] == 'X') upp = j;
up[j][i] = upp;
}
for(int j = H; j >= 1; j--) {
if(v[j][i] == 'X') dwn = j;
dw[j][i] = dwn;
}
}
}
void solve() {
cin >> W >> H >> K >> L >> xh >> yh >> xv >> yv;
xh++,yh++,xv++,yv++;
int sx = 0, sy = 0;
for(int i = 1; i <= H; i++) {
for(int j = 1; j <= W; j++) {
cin >> v[i][j];
if(v[i][j] == '*') sx = i, sy = j;
}
}
prep();
dfs(yh, xv);
cout << (used[sx][sy] ? "YES" : "NO");
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int t = 1;
// cin >> t;
for(int T = 1; T <= t; T++) {
// cout << "Case: " << T << endl;
solve();
}
}
