head=0;tail=1;
do{
	head++;
	for( int i=1;i<=4;i++)
	{
	int x3,y3;
		x3=a[head][1]+dx[i];
		y3=a[head][2]+dy[i];
		if(ju[x3][y3]=='0'&&x3>0&&x3<=n&&y3>0&&y3<=n)
		{
			tail++;
		b[tail]=b[head]+1;
			a[tail][1]=x3;
			a[tail][2]=y3;
			ju[x3][y3]=1;};
		if(a[tail][1]==c&&a[tail][2]==e)
		{
			cout<<b[tail]<<endl;
		return 0;
		}
		}
	
}while (head<tail);

cin>>n;
int i,j,x1,y1,x2,y2;
for(i=1;i<=n;i++)
for(j=1;i<=n;j++)
{
 cin>>ju[i][j];
 }
cin>>x1>>y1>>x2>>y2;
c=x2;
e=y2;
bfs(x1,y1);
return 0;