#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<long long, long long>;
constexpr char ln =  '\n';
constexpr long long MOD = 1000000007;
//constexpr long long MOD = 998244353;
constexpr long long INF = 1000000000 + 100;
constexpr long long LINF = 1000000000000000000 + 100;
#define all(x) (x).begin(),(x).end()
#define whole(f,x,...) ([&](decltype((x)) whole) { return (f)(begin(whole), end(whole), ## __VA_ARGS__); })(x)
#define rep(i,n) for(int i=0;i<(n);i++)
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> using V = vector<T>;

int dx[4] = {-1,0,1,0};
int dy[4] = {0,-1,0,1};

int main(){
    int H, W, X, Y; cin >> H >> W >> X >> Y; X--, Y--;
    V<string> grid(H); rep(i, H)cin >> grid[i];

    int res = 1;
    rep(k, 4){
        int x = X, y = Y;
        while(1){
            x += dx[k], y += dy[k];
            if(x<0 or y<0 or x>=H or y>=W)break;
            if(grid[x][y]=='#')break;
            res++;
        }
    }
    cout << res << ln;
}

#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>

// find_by_order(k) returns the iterator to the kth largest element (start from 0)
// order_of_key(k) returns the number of elements in the set which are strictly less than the value k

using namespace std;
using namespace __gnu_pbds;

#define ff              first
#define ss              second
#define all(v)          v.begin(), v.end()
#define int             long long
#define pb              push_back
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define rightmostbit(x) __builtin_ffsll(x)
#define mod             1000000007
#define inf             1e18
#define pi              3.141592653589793238
#define mk(a,n)         int n;cin>>n;vi a(n);for(int i=0;i<n;i++) cin>>a[i]
#define endl            "\n"
#define w(x)            int x; cin>>x; while(x--)

#define deb(...) cerr << "[" << #__VA_ARGS__ << "]: "; cerr << to_string(__VA_ARGS__) << endl
template <typename T, size_t N> int SIZE(const T (&t)[N]) { return N; } template<typename T> int SIZE(const T &t) { return t.size(); } string to_string(const string s, int x1 = 0, int x2 = 1e9) { return '"' + ((x1 < s.size()) ? s.substr(x1, x2 - x1 + 1) : "") + '"'; } string to_string(const char* s) { return to_string((string) s); } string to_string(const bool b) { return (b ? "true" : "false"); } string to_string(const char c) { return string({c}); } template<size_t N> string to_string(const bitset<N> &b, int x1 = 0, int x2 = 1e9) { string t = ""; for (int __iii__ = min(x1, SIZE(b)),  __jjj__ = min(x2, SIZE(b) - 1); __iii__ <= __jjj__; ++__iii__) { t += b[__iii__] + '0'; } return '"' + t + '"'; } template <typename A, typename... C> string to_string(const A (&v), int x1 = 0, int x2 = 1e9, C... coords); int l_v_l_v_l = 0, t_a_b_s = 0; template <typename A, typename B> string to_string(const pair<A, B> &p) { l_v_l_v_l++; string res = "(" + to_string(p.first) + ", " + to_string(p.second) + ")"; l_v_l_v_l--; return res; } template <typename A, typename... C> string to_string(const A (&v), int x1, int x2, C... coords) { int rnk = rank<A>::value; string tab(t_a_b_s, ' '); string res = ""; bool first = true; if (l_v_l_v_l == 0) res += "\n"; res += tab + "["; x1 = min(x1, SIZE(v)), x2 = min(x2, SIZE(v)); auto l = begin(v); advance(l, x1); auto r = l; advance(r, (x2 - x1) + (x2 < SIZE(v))); for (auto e = l; e != r; e = next(e)) { if (!first) { res += ", "; } first = false; l_v_l_v_l++; if (e != l) { if (rnk > 1) { res += "\n"; t_a_b_s = l_v_l_v_l; }; } else { t_a_b_s = 0; } res += to_string(*e, coords...); l_v_l_v_l--; } res += "]"; if (l_v_l_v_l == 0) res += "\n"; return res; } void dbgm() {;} template<typename Heads, typename... Tails> void dbgm(Heads H, Tails... T) { cerr << to_string(H) << " | "; dbgm(T...); }
#define debm(...) cerr << "[" << #__VA_ARGS__ << "]: "; dbgm(__VA_ARGS__); cerr << endl

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;
void g_b()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	freopen("error.txt", "w", stderr);
#endif
}

const int N = 2e5 + 6;

int32_t main()
{

	g_b();
	int h, w, x, y; cin >> h >> w >> x >> y;
	char a[h + 1][w + 1];
	for (int i = 1; i <= h; i++)
		for (int j = 1; j <= w; j++)
			cin >> a[i][j];
	int ans = 0;
	ans += (a[x][y] == '.');
	for (int j = y + 1; j <= w; j++) {
		if (a[x][j] == '.') ans++;
		else break;
	}
	for (int j = y - 1; j >= 1; j--)
	{
		if (a[x][j] == '.') ans++;
		else break;
	}
	for (int i = x + 1; i <= h; i++) {
		if (a[i][y] == '.') ans++;
		else break;
	}
	for (int i = x - 1; i >= 1; i--)
	{
		if (a[i][y] == '.') ans++;
		else break;
	}
	cout << ans;
	return 0;

}
