/*
_ __ __ __ ____ ___ _ __
| | /| / / ___ _ / /_ ____ / / / __ \ ___ ___ / _ \ (_) ___ ____ ___ / /
| |/ |/ / / _ `// __// __/ / _ \ / /_/ / / _ \/ -_) / ___/ / / / -_)/ __// -_) /_/
|__/|__/ \_,_/ \__/ \__/ /_//_/ \____/ /_//_/\__/ /_/ /_/ \__/ \__/ \__/ (_)
*/
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
// #pragma GCC target("avx2")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define ld long double
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define rsz resize
#define fi first
#define se second
#define LMAX LLONG_MAX
#define LMIN LLONG_MIN
#define IMAX INT_MAX
#define IMIN INT_MIN
#define endl "\n"
#define newline cout << endl;
using namespace std;
// constants
// functions
// structs
struct node
{
int l, r, u, d;
};
// globals
// notes
/*
My favorite anime is One Piece(obviously)
My oshi(Yes, I have an oshi, deal with it) is Kamil_Tsubaki
-stuff you should look for-
* int overflow, array bounds
* special cases (n=1?)
* do something instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
continue - skip the rest in the loop
*/
void solve()
{
int n, m, K, L;
cin >> m >> n >> K >> L;
int rh, ch, rv, cv;
cin >> ch >> rh >> cv >> rv;
ch++, rh++, cv++, rv++;
vector <vector <char> > v(n + 1, vector <char>(m + 1));
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= m; j++)
{
cin >> v[i][j];
}
}
vector <vector <node> > g(n + 1, vector <node>(m + 1));
for (int i = 1; i <= n; i++)
{
int lst = 0;
for (int j = 1; j <= m; j++)
{
g[i][j].l = lst;
if (v[i][j] == 'X')
{
lst = j;
}
}
lst = m + 1;
for (int j = m; j >= 1; j--)
{
g[i][j].r = lst;
if (v[i][j] == 'X')
{
lst = j;
}
}
}
for (int j = 1; j <= m; j++)
{
int lst = 0;
for (int i = 1; i <= n; i++)
{
g[i][j].u = lst;
if (v[i][j] == 'X')
{
lst = i;
}
}
lst = n + 1;
for (int i = n; i >= 1; i--)
{
g[i][j].d = lst;
if (v[i][j] == 'X')
{
lst = i;
}
}
}
auto isv = [&](int r, int c)
{
if (r < 1 || r > n || c < 1 || c > m || v[r][c] == 'X')
{
return false;
}
return (g[r][c].r - g[r][c].l - 1 >= K) && (g[r][c].d - g[r][c].u - 1 >= L);
};
queue <pair <int, int> > q;
vector <vector <bool> > used(n + 1, vector <bool>(m + 1, false));
if (isv(rh, cv))
{
used[rh][cv] = true;
q.push({rh, cv});
}
while (!q.empty())
{
auto [r, c] = q.front();
q.pop();
for (auto [ur, uc] : vector <pair <int, int> >{{1, 0}, {-1, 0}, {0, 1}, {0, -1}})
{
ur += r, uc += c;
if (isv(ur, uc) && !used[ur][uc])
{
used[ur][uc] = true;
q.push({ur, uc});
}
}
}
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= m; j++)
{
if (v[i][j] == '*')
{
cout << (used[i][j] ? "YES" : "NO");
return;
}
}
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
// cin >> t;
while (t--)
{
solve();
newline
}
}
/*
$$$$$$$$\ $$$$$$$$\
$$ _____|\____$$ |
$$ | $$ /
$$$$$\ $$ /
$$ __| $$ /
$$ | $$ /
$$$$$$$$\ $$$$$$$$\
\________|\________|
*/
