#include<bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
int W, H, K, L;
const int MAX_N = 2500;
int dist_dir[4][MAX_N][MAX_N];
char cont[MAX_N][MAX_N];
struct Grid{
int a, b;
vector<vector<pii>> true_name;
Grid(int _a, int _b){
a= _a;
b= _b;
true_name.resize(a, vector<pii>(b));
for(int i = 0; i<a; i++){
for(int j = 0; j<b;j++){
true_name[i][j] = {i, j};
}
}
}
Grid flip(){
Grid res(b, a);
for(int i = 0; i<a; i++){
for(int j = 0; j<b; j++){
res.true_name[j][a-i-1] = true_name[i][j];
}
}
return res;
}
void calc_dist(int dir_id){
for(int i = 0; i<a; i++){
int streak= 0;
for(int j = 0; j<b; j++){
pii real = true_name[i][j];
if(cont[real.first][real.second] == 'X'){
streak = 0;
}
else{
streak++;
}
dist_dir[dir_id][real.first][real.second] = streak;
}
}
}
};
int get_inter_len(pii a, pii b, int dir){
int res = min(dist_dir[dir][a.first][a.second], dist_dir[dir][b.first][b.second]) + min(dist_dir[dir+2][a.first][a.second], dist_dir[dir+2][b.first][b.second])-1;
return res;
}
vector<pii> get_adj(pii pos){
vector<pii> res;
if(pos.first>0){
pii other = {pos.first-1, pos.second};
if(get_inter_len(pos, other, 0)>=K){
res.push_back(other);
}
}
if(pos.first<H-1){
pii other = {pos.first+1, pos.second};
if(get_inter_len(pos, other, 0)>=K){
res.push_back(other);
}
}
if(pos.second>0){
pii other = {pos.first, pos.second-1};
if(get_inter_len(pos, other, 1)>=L){
res.push_back(other);
}
}
if(pos.second<W-1){
pii other = {pos.first, pos.second+1};
if(get_inter_len(pos, other, 1)>=L){
res.push_back(other);
}
}
return res;
}
bool dfs(vector<vector<bool>>& vis, pii cur_pos){
vis[cur_pos.first][cur_pos.second] = true;
if(cont[cur_pos.first][cur_pos.second] == '*'){
return true;
}
for(auto e: get_adj(cur_pos)){
if(!vis[e.first][e.second]){
if(dfs(vis, e)){
return true;
}
}
}
return false;
}
signed main(){
cin>>W>>H>>K>>L;
pii h, v;
cin>>h.second>>h.first>>v.second>>v.first;
pii init_pos = {h.first, v.second};
Grid grid(H, W);
for(int i = 0; i<H; i++){
for(int j = 0; j<W; j++){
cin>>cont[i][j];
}
}
for(int k= 0; k<4; k++){
grid.calc_dist(k);
grid = grid.flip();
}
vector<vector<bool>> vis(H, vector<bool>(W));
if(dfs(vis, init_pos)){
cout<<"YES"<<endl;
return 0;
}
else{
cout<<"NO"<<endl;
return 0;
}
}
