#include<iostream>#include<string.h>#include<stdio.h>using namespace std;char Mp[30][30];int dir[8][2]={{1,0},{-1,0},{0,1},{0,-1},{1,1},{1,-1},{-1,1},{-1,-1}};int DFS(int r,int c){if(Mp[r][c]=='.'||Mp[r][c]=='n') return 0;Mp[r][c]='n';int sum=0;for(int i=0;i!=4;i++)sum+=(Mp[r+dir[i][0]][c+dir[i][1]]=='.');for(int i=0;i!=8;i++)sum+=DFS(r+dir[i][0],c+dir[i][1]);return sum;}int main(){int row,col,r,c;while(cin>>row>>col>>r>>c && row){memset(Mp,'.',sizeof(Mp));for(int i=1;i<=row;i++)for(int j=1; j<=col;j++)cin>>Mp[i][j];cout<<DFS(r,c)<<endl;}}
