#include <bits/stdc++.h>
using namespace std;
int main()
{
int W, H, K, L;
cin >> W >> H >> L >> K;
vector<vector<int>> dp(H, vector<int>(W, 0));
vector<vector<pair<int, int>>> cumH(H, vector<pair<int, int>>(W, {1000000, 1000000})), cumW(H, vector<pair<int, int>>(W, {1000000, 1000000}));
int x1, x2, y1, y2;
queue<pair<int, int>> Q;
cin >> y1 >> x1 >> y2 >> x2;
Q.push({x1, y2});
pair<int, int> targ;
for (int i = 0; i < H; i++)
{
string S;
cin >> S;
for (int j = 0; j < W; j++)
{
if (S[j] == '*')
targ = {i, j};
if (S[j] == 'X')
{
cumH[i][j].first = 0;
cumH[i][j].second = 0;
cumW[i][j].first = 0;
cumW[i][j].second = 0;
}
}
}
for (int i = 0; i < H; i++)
{
for (int j = 0; j < W; j++)
{
if (i == 0)
{
cumH[i][j].first = min(cumH[i][j].first, 1);
}
else
{
cumH[i][j].first = min(cumH[i][j].first, cumH[i - 1][j].first + 1);
}
if (j == 0)
{
cumW[i][j].first = min(cumW[i][j].first, 1);
}
else
{
cumW[i][j].first = min(cumW[i][j].first, cumW[i][j - 1].first + 1);
}
}
}
for (int i = H - 1; i >= 0; i--)
{
for (int j = W - 1; j >= 0; j--)
{
if (i == H - 1)
{
cumH[i][j].second = min(cumH[i][j].second, 1);
}
else
{
cumH[i][j].second = min(cumH[i][j].second, cumH[i + 1][j].second + 1);
}
if (j == W - 1)
{
cumW[i][j].second = min(cumW[i][j].second, 1);
}
else
{
cumW[i][j].second = min(cumW[i][j].second, cumW[i][j + 1].second + 1);
}
}
}
while (!Q.empty())
{
int x = Q.front().first;
int y = Q.front().second;
Q.pop();
if (dp[x][y])
continue;
dp[x][y] = 1;
if (x > 0)
{
if (min(cumW[x][y].first, cumW[x - 1][y].first) + min(cumW[x][y].second, cumW[x - 1][y].second) > L)
{
Q.push({x - 1, y});
}
}
if (x < H - 1)
{
if (min(cumW[x][y].first, cumW[x + 1][y].first) + min(cumW[x][y].second, cumW[x + 1][y].second) > L)
{
Q.push({x + 1, y});
}
}
if (y > 0)
{
if (min(cumH[x][y].first, cumH[x][y - 1].first) + min(cumH[x][y].second, cumH[x][y - 1].second) > K)
{
Q.push({x, y - 1});
}
}
if (y < W - 1)
{
if (min(cumH[x][y].first, cumH[x][y + 1].first) + min(cumH[x][y].second, cumH[x][y + 1].second) > K)
{
Q.push({x, y + 1});
}
}
}
if (dp[targ.first][targ.second])
cout << "YES";
else
cout << "NO";
}
