import java.util.Scanner;
public class Main {
static boolean[][] region ;
static int[][] mojaz={{1,0},{0,1},{-1,0},{0,-1}};
static int max=0;
static int cnt=0;
static int c;
static int r;
static int x;
static int y;
public static void main
(String[] args
){ Scanner in
= new Scanner
(System.
in); char[][] ar ;
while(in.hasNext()){
r= in.nextInt();
c= in.nextInt();
ar=new char[r][c];
region=new boolean[r+2][c+2];
cnt=0;
max=0;
for(int i=0;i<r;i++){
line=in.next();
for(int j=0;j<c;j++){
ar[i][j]=line.charAt(j);
}
}
x = in.nextInt();
y = in.nextInt();
char p = ar[x][y];
for(int i=0;i<r;i++){
for(int j=0;j<c;j++){
if(ar[i][j]==p){
region[i][j]=true;
}else
region[i][j]=false;
}
}
dfs(x, y);
cnt = 0;
for(int i=0;i<r;i++){
for(int j=0;j<c;j++){
if(region[i][j]){
dfs(i,j);
if(cnt>max){
max=cnt;
}
cnt=0;
}
}
}
//in.nextLine();
}
}
public static void dfs(int row,int col){
if(region[row][col]){
region[row][col]=false;
cnt++;
for(int i=0;i<mojaz.length;i++){
int dx=mojaz[i][0]+row;
int dy =(c+mojaz[i][1]+col)%c;
if(dx>=0 && dx<r && region[dx][dy]){
dfs(dx, dy);
}
}
}
}
}
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