#include <bits/stdc++.h> using namespace std; #define int long long #define OYY LLONG_MAX #define mod 1000000007 #define faster ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); #define FOR for(int i=1;i<=n;i++) #define mid (start+end)/2 #define lim 1505 #define fi first #define se second #define pb push_back typedef long double lo; int h,w,k,l; char dizi[lim][lim]; int arr[lim][lim]; int le[lim][lim],ri[lim][lim],up[lim][lim],down[lim][lim]; int vis[lim][lim]; inline bool check(int x,int y){ return x<=w && y<=h && x>=1 && y>=1; } int32_t main(){ faster cin>>h>>w>>k>>l; int p1,p2,pp1,pp2;cin>>p1>>p2>>pp1>>pp2; int tar1,tar2; for(int i=1;i<=w;i++){ for(int j=1;j<=h;j++){ cin>>dizi[i][j]; if(dizi[i][j]=='X')arr[i][j]=-1; else if(dizi[i][j]=='*'){tar1=i,tar2=j;} } } for(int i=1;i<=w;i++){ for(int j=1;j<=h;j++){ le[i][j]=le[i][j-1]+1; if(arr[i][j]==-1)le[i][j]=0; } for(int j=h;j>=1;j--){ ri[i][j]=ri[i][j+1]+1; if(arr[i][j]==-1)ri[i][j]=0; } } for(int i=1;i<=h;i++){ for(int j=1;j<=w;j++){ up[j][i]=up[j-1][i]+1; if(arr[j][i]==-1)up[j][i]=0; } for(int j=w;j>=1;j--){ down[j][i]=down[j+1][i]+1; if(arr[j][i]==-1)down[j][i]=0; } } //~ for(int i=1;i<=w;i++){ //~ for(int j=1;j<=h;j++){ //~ cout<<down[i][j]<<" "; //~ } //~ cout<<endl; //~ } p2++; pp1++; queue<pair<int,int>> qu; qu.push({p2,pp1}); while(qu.size()){ int x=qu.front().fi,y=qu.front().se; //cout<<x<<" "<<y<<endl; qu.pop(); if(vis[x][y])continue; vis[x][y]=1; if(check(x+1,y) && arr[x+1][y]!=-1 && min(le[x][y]+ri[x][y]-1,le[x+1][y]+ri[x+1][y]-1)>=k)qu.push({x+1,y}); //cout<<min(le[x][y]+ri[x][y]-1,le[x+1][y]+ri[x+1][y]-1)<<" "<<check(x+1,y)<<" "<<arr[x+1][y]<<endl; if(check(x-1,y) && arr[x-1][y]!=-1 && min(le[x][y]+ri[x][y]-1,le[x-1][y]+ri[x-1][y]-1)>=k)qu.push({x-1,y}); if(check(x,y+1) && arr[x][y+1]!=-1 && min(up[x][y]+down[x][y]-1,up[x][y+1]+down[x][y+1]-1)>=l)qu.push({x,y+1}); //cout<<up[x][y]<<" "<<down[x][y]<<" "<<up[x][y+1]<<" "<<down[x][y+1]<<" "<<check(x,y+1)<<" "<<arr[x][y+1]<<endl; if(check(x,y-1) && arr[x][y-1]!=-1 && min(up[x][y]+down[x][y]-1,up[x][y-1]+down[x][y-1]-1)>=l)qu.push({x,y-1}); } if(vis[tar1][tar2])cout<<"YES"<<'\n'; else cout<<"NO"<<'\n'; return 0; }