#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1510;
int dx[] = {0, 0, 1, -1}, dy[] = {1, -1, 0, 0};
int marc[MAXN][MAXN], cnt[MAXN][MAXN];
int pre_row[MAXN][MAXN], pre_col[MAXN][MAXN];
int nxt_row[MAXN][MAXN], nxt_col[MAXN][MAXN];
char m[MAXN][MAXN];
int w, h, k, l;
bool check(int x, int y){
return 0 <= x && x < h && 0 <= y && y < w;
}
bool can_reach(int x, int y, int nx, int ny){
if(m[x][y] == 'X' || m[nx][ny] == 'X') return false;
bool ans = true;
// k eh o tamanho horizontal
// l eh o tamanho vertical
int cur_window = 0;
if(nx == x){
cur_window = nxt_row[x][y] - pre_row[x][y] + 1;
} else cur_window = nxt_col[x][y] - pre_col[x][y] + 1;
if(nx == x){
ans &= (cur_window >= k);
} else ans &+ (cur_window >= l);
// agora checo o outro metal
int lx = 0, rx = 0;
if(nx == x){
// entao agora eh vertical
lx = max(pre_col[x][y], pre_col[nx][ny]);
rx = min(nxt_col[x][y], nxt_col[nx][ny]);
} else{
lx = max(pre_row[x][y], pre_row[nx][ny]);
rx = min(nxt_row[x][y], nxt_row[nx][ny]);
}
cur_window = rx - lx + 1;
if(nx == x){
ans &= (cur_window >= l);
} else ans &= (cur_window >= k);
// if(ans) cout << x << " " << y << " -> " << nx << " " << ny << endl;
return ans;
}
void dfs(int x, int y){
marc[x][y] = 1;
for(int k=0; k<4; k++){
int nx = x + dx[k], ny = y + dy[k];
if(!check(nx, ny) || marc[nx][ny]) continue;
if(!can_reach(x, y, nx, ny)) continue;
dfs(nx, ny);
}
}
int main(){
cin.tie(0)->sync_with_stdio(0);
cin >> w >> h >> k >> l;
int xh, yh; cin >> xh >> yh;
int xv, yv; cin >> xv >> yv;
for(int j=yh; j<(yh + k); j++) cnt[xh][j] ++;
for(int i=xv; i<(xv + l); i++) cnt[i][yv] ++;
int x_s = 0, y_s = 0;
int x_t = 0, y_t = 0;
for(int i=0; i<h; i++){
for(int j=0; j<w; j++){
cin >> m[i][j];
if(m[i][j] == '*'){
x_t = i;
y_t = j;
}
if(cnt[i][j] > 1){
x_s = i;
y_s = j;
}
}
}
for(int i=0; i<h; i++){
for(int j=0; j<w; j++){
if(m[i][j] == 'X'){
pre_row[i][j] = i + 1;
pre_col[i][j] = j + 1;
} else{
pre_row[i][j] = (i > 0 ? pre_row[i - 1][j] : 0);
pre_col[i][j] = (j > 0 ? pre_col[i][j - 1] : 0);
}
}
}
for(int i=(h - 1); i>=0; i--){
for(int j=(w - 1); j>=0; j--){
if(m[i][j] == 'X'){
nxt_row[i][j] = i - 1;
nxt_col[i][j] = j - 1;
} else{
nxt_row[i][j] = (i < h - 1 ? nxt_row[i + 1][j] : h - 1);
nxt_col[i][j] = (j < w - 1 ? nxt_col[i][j + 1] : w - 1);
}
}
}
dfs(x_s, y_s);
cout << (marc[x_t][y_t] ? "YES" : "NO") << "\n";
return 0;
}
