#include <iostream>
#include <fstream>
#include <queue>
#include <cstring>
using namespace std;
int n,m;
string Map[101][101],cartela;

queue < pair < int, int > > coada;
int startx,starty,stopx,stopy;
int di[]={ -1, 0, 1,  0};
int dj[]={  0, 1, 0, -1};
short int c,nr = 0;
int Map2[101][101];
void citire()
{
    ifstream f("barlog.in");
    f >> c;
    f >> n >> m;
    for (int i = 1 ;i <=n ; i++)
    for (int j=1; j <= m ; j++) f >> Map[i][j];

 f >> startx >> starty;
 coada.push(make_pair(startx,starty));
 Map2[startx][starty]=1;
 f >> cartela;
 f.close();
}
bool ok(int i, int j)
{
    if (i < 1 || j < 1 || j > m || i > n) return false;

    return true;
}

bool ok2(int i,int j)
{

  unsigned int st = 0 , dr = 0;
  unsigned int n = Map[i][j].size(), m = cartela.size();

    while ( st < n  &&  dr < m)
    {
        if (Map[i][j][st] == cartela[dr])
        {
            st ++; dr++ ;
        }
        else dr ++;

    }
    if ( st == n  )return true;
     return false;
}


void lee()
{
    int i, j,i_urm, j_urm;
    while(! coada.empty())
    {
        i = coada.front().first;
        j = coada.front().second;
        coada.pop();
        for(int directie = 0; directie < 4 ; directie++)
        {
            i_urm = i + di[directie];
            j_urm = j + dj[directie];

            if(ok(i_urm,j_urm) && ok2(i_urm,j_urm) && Map2[i_urm][j_urm] != 0)
            {
              nr ++;
             Map2[i_urm][j_urm] =  Map2[i][j] + 1;
             coada.push(make_pair(i_urm,j_urm));

            }

        }
    }
cout << nr;
}
int main()
{ ofstream g("barlog.out");
    citire();
    lee();


 return 0;



}