#include<stdio.h>
#include<iostream>
using namespace std;
const int maxn=505,maxq=50005;
const int  dx[9]={0,-1,1,0,0,-1,-1,1,1},dy[9]={0,0,0,-1,1,-1,1,1,-1};
const char sea='.',land='#',sea1=' ',land1='&';
char map[maxn][maxn];
int qx[maxq],qy[maxq],m,n,x,y,u,h,f,r,i,j;
int ans;
void init(){
     scanf("%d",&n);scanf("%d",&m);scanf("%d",&y);scanf("%d",&x);
     for(i=0;i<=n+1;i++)map[0][i]=land,map[m+1][i]=land;
     for(i=1;i<=m;i++)map[i][0]=land,map[i][n+1]=land;
     for(i=1;i<=m;i++)cin>>(map[i]+1);
}
void floodfill(int x,int y,char c1,char c2,char c3,int dir){
     int  i;
     f=0;r=1;qx[1]=x;qy[1]=y;map[x][y]=c3;
     do{
        f++;if(f>maxq)f=1;
        for(i=1;i<=dir;i++)
          if(map[qx[f]+dx[i]][qy[f]+dy[i]]==c1||map[qx[f]+dx[i]][qy[f]+dy[i]]==c2)
          {r++;if(r>maxq)r=1;qx[r]=qx[f]+dx[i];qy[r]=qy[f]+dy[i];map[qx[r]][qy[r]]=c3;}
        }while(f!=r);
}
void work(){
     floodfill(x,y,sea,sea,sea1,8);
     floodfill(0,0,sea,land,land1,4);
     for(int i=1;i<=m;i++)
       for(int j=1;j<=n;j++)
         if(map[i][j]==land){ans++;floodfill(i,j,land,land,land1,4);}
}
void print(){
     printf("%d\n",ans);
}
int main(){
    init();
    work();
    print();
    return 0;
}

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