# include <iostream>
# include <cstdio>
using namespace std;
int L, ans;
char a[2002][2002];
int cross(int x, int y) {
	int length=1;
	if(x<=1||x>=L)return 1;
	for (int i=1;; i++) {
		if(x-i<=0||x+i>=L+1) return length;
		else if (a[x-i][y]!=a[x+i][y]) return length;
		else length +=2;
	}
}
int down(int x, int y) {
	int length=1;
	if(y<=1||y>=L) return 1;
	for (int i=1;; i++) {
		if(y-i<=0||y+i>=L+1)return length;
		else if (a[x][y-i]!=a[x][y+i]) return length;
		else length += 2;
	}
}
int MAXN(int a, int b) {
	if(a >= b) return a;
	else return b;
}
int main() {
	cin>>L;
	for(int i=1; i<=L; i++)
		for(int j=1; j<=L; j++)
			cin>>a[i][j];
	int x, y;
	cin>>x>>y;
	ans=MAXN(cross(x,y),down(x,y));
	cout<<ans;
	return 0;
}