#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
using namespace std;
const ll NN=3e6+5,N=1505,INF=1e12;
ll ans,n,m,k,l,par[NN],sz[NN],r_suf[N][N],r_pref[N][N],d[N][N],c_pref[N][N],c_suf[N][N],idx1,idx2,idx3,idx4,st,en,x,y;
char a[N][N];
int find_set(int u){
if (par[u]==u) return u;
return par[u]=find_set(par[u]);
}
void unite_set(int a,int b){
a=find_set(a);
b=find_set(b);
if (a==b) return ;
if (sz[a]<sz[b]) swap(a,b);
sz[a]+=sz[b]; par[b]=a;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
cin >> n >> m >> k >> l; swap(n,m);
cin >> idx1 >> idx2 >> idx3 >> idx4;
idx1=idx2+1;
idx2=idx3+1;
st=(idx1-1)*m+idx2;
for (int i=1; i<=n; i++){
for (int j=1; j<=m; j++){
cin>> a[i][j];
}
}
for (int i=1; i<=n*m; i++){
par[i]=i; sz[i]=1;
}
for (int i=1; i<=n; i++){
for (int j=1; j<=m; j++){
if (a[i][j]=='X') r_pref[i][j]=j;
else r_pref[i][j]=r_pref[i][j-1];
}
r_suf[i][m+1]=m+1;
for (int j=m; j>=1; j--){
if (a[i][j]=='X') r_suf[i][j]=j;
else r_suf[i][j]=r_suf[i][j+1];
}
}
for (int i=1; i<=m; i++){
for (int j=1; j<=n; j++){
if (a[j][i]=='X') c_pref[j][i]=j;
else c_pref[j][i]=c_pref[j-1][i];
}
c_suf[n+1][i]=n+1;
for (int j=n; j>=1; j--){
if (a[j][i]=='X') c_suf[j][i]=j;
else c_suf[j][i]=c_suf[j+1][i];
}
}
for (int i=1; i<=n; i++){
for (int j=1; j<=m; j++){
x=c_suf[i][j]-c_pref[i][j]-1;
y=r_suf[i][j]-r_pref[i][j]-1;
if (x>=l && y>=k) d[i][j]=1; else d[i][j]=0;
}
}
for (int i=1; i<=n; i++){
for (int j=1; j<=m; j++){
// cout<<i<<" "<<j<<" "<<c_pref[i][j]<<" "<<c_suf[i][j]<<endl;
if (a[i][j]=='*'){
idx1=i; idx2=j;
en=(i-1)*m+j;
}
if (d[i][j]==0) continue;
// marjvniv
if (j<m && d[i][j+1]==1){
x=min(c_suf[i][j],c_suf[i][j+1]);
y=max(c_pref[i][j],c_pref[i][j+1]);
if (x-y+1>=l)
unite_set((i-1)*m+j,(i-1)*m+j+1);
}
//zevit
if (i>1 && d[i-1][j]==1){
x=min(r_suf[i][j],r_suf[i][j+1]);
y=max(r_pref[i][j],r_pref[i][j+1]);
if (x-y+1>=k)
unite_set((i-2)*m+j,(i-1)*m+j);
}
}
}
x=find_set(st); y=find_set(en);
if (x==y && d[idx1][idx2]==1) cout<<"YES"<<endl; else cout<<"NO"<<endl;
}
