#include <bits/stdc++.h>
using namespace std;
const int MAXN=1510;
int n, m, w, h;
int marc1[MAXN][MAXN], marc2[MAXN][MAXN], v[MAXN][MAXN], scol[MAXN][MAXN], sline[MAXN][MAXN];
void dfs1(int col, int lst, int lend){
while(0<=lst and v[lst][col]==0){
lst--;
}
if(lst<0 or v[lst][col]){
lst++;
}
while(lend<m and v[lend][col]==0){
lend++;
}
if(lend>=m or v[lend][col]){
lend--;
}
for(int k=lst;k<=lend;k++){
marc1[k][col]=1;
}
for(int k=lst;k<=lend-h+1;k++){
if(col!=n-1 and scol[col+1][k]==scol[col+1][k+h-1] and v[k][col+1]==0 and marc1[k][col+1]==0){
dfs1(col+1, k, k+h-1);
}
if(col!=0 and scol[col-1][k]==scol[col-1][k+h-1] and v[k][col-1]==0 and marc1[k][col-1]==0){
dfs1(col-1, k, k+h-1);
}
}
}
void dfs2(int line, int cst, int cend){
while(0<=cst and v[line][cst]==0){
cst--;
}
if(cst<0 or v[line][cst]){
cst++;
}
while(cend<n and v[line][cend]==0){
cend++;
}
if(cend>=n or v[line][cend]){
cend--;
}
for(int k=cst;k<=cend;k++){
marc2[line][k]=1;
}
for(int k=cst;k<=cend-w+1;k++){
if(line!=m-1 and sline[line+1][k]==sline[line+1][k+w-1] and v[line+1][k]==0 and marc2[line+1][k]==0){
dfs2(line+1, k, k+w-1);
}
if(line!=0 and sline[line-1][k]==sline[line-1][k+w-1] and v[line-1][k]==0 and marc2[line-1][k]==0){
dfs2(line-1, k, k+w-1);
}
}
}
int marc3[MAXN][MAXN];
void dfs3(int l, int c){
marc3[l][c]=1;
if(l!=m-1 and marc3[l+1][c]==0 and marc1[l+1][c]==1 and marc2[l+1][c]==1){
dfs3(l+1, c);
}
if(l!=0 and marc3[l-1][c]==0 and marc1[l-1][c]==1 and marc2[l-1][c]==1){
dfs3(l-1, c);
}
if(c!=n-1 and marc3[l][c+1]==0 and marc1[l][c+1]==1 and marc2[l][c+1]==1){
dfs3(l, c+1);
}
if(c!=0 and marc3[l][c-1]==0 and marc1[l][c-1]==1 and marc2[l][c-1]==1){
dfs3(l, c-1);
}
}
int main(){
cin>>n>>m>>w>>h;
int xh, yh, xv, yv;
cin>>xh>>yh>>xv>>yv;
int fx, fy;
for(int k=0;k<m;k++){
for(int i=0;i<n;i++){
char c;
cin>>c;
if(c=='X'){
v[k][i]=1;
sline[k][i]=1+sline[k][i-1];
scol[i][k]=1+scol[i][k-1];
}else if(c=='*'){
fx=k, fy=i;
sline[k][i]=sline[k][i-1];
scol[i][k]=scol[i][k-1];
}else{
sline[k][i]=sline[k][i-1];
scol[i][k]=scol[i][k-1];
}
}
}
dfs1(xv, yv, yv+h-1);
dfs2(yh, xh, xh+w-1);
dfs3(yh, xv);
if(marc3[fx][fy]){
cout<<"YES";
}else{
cout<<"NO";
}
}
