#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int, int>
#define all(x) (x).begin(),(n).end()
vector<vector<vector<vector<int>>>> est;
int n, m, l, k;
vector<vector<char> > mat;
vector<pii> viz = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
bool sol(int x1, int y1, int x2, int y2){
// cout << x1 << " "<<y1<<" "<<x2<<" "<<y2<<endl;
if(x1<0||x1>=n||y1<0||y1>=m||x2<0||x2>=n||y2<0||y2>=m)return 0;
if(est[x1][y1][x2][y2]!=-1)return 0;
est[x1][y1][x2][y2]=1;
for(int i=y1; i<y1+k-1; i++){
if(i<0||i>=m||mat[x1][i]=='X')return 0;
}
for(int i=x2; i<x2+l-1; i++){
if(i<0||i>=n||mat[i][y2]=='X')return 0;
}
if(mat[x1][y2]=='*')return 1;
for(auto [ax, ay]:viz){
if(sol(x1+ax, y1+ay, x2, y2))return 1;
if(sol(x1, y1, x2+ax, y2+ay))return 1;
}
return 0;
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m >> k >> l;
swap(n, m);
mat.resize(n, vector<char>(m));
est.resize(n, vector<vector<vector<int>>>(m, vector<vector<int>>(n, vector<int>(m, -1))));
int x1, y1, x2, y2; cin >> x1 >> y1 >> x2 >> y2;
swap(x1, y1);
swap(x2, y2);
int qx=0, qy=0;
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
cin >> mat[i][j];
}
}
if(sol(x1, y1, x2, y2)){
cout << "YES"<<endl;
}else cout << "NO"<<endl;
}
