#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("matrix.in");
ofstream fout("matrix.out");

const int NMAX = 1005;
int m, n, ans;
char a[NMAX][NMAX];
int dp[NMAX][NMAX], fr[30];
bool viz[NMAX][NMAX];

void citire()
{
    char x;
    fin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        fin >> (a[i] + 1);
    }
    for (int i = 1; i <= m; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            fin >> x;
            fr[x - 'a']++;
        }
    }
}

void solve()
{
    for (int k = 0; k < 26; k++)
    {
        for (int i = 0; i <= n; i++)
        {
            dp[i][0] = 0;
            dp[0][i] = 0;
        }
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                dp[i][j] = dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1];
                if ((a[i][j] - 'a') == k)
                {
                    dp[i][j]++;
                }
            }
        }
        for (int i = m; i <= n; i++)
        {
            for (int j = m; j <= n; j++)
            {
                if (dp[i][j] - dp[i][j - m] - dp[i - m][j] + dp[i - m][j - m] != fr[k])
                    viz[i][j] = true;
            }
        }
    }
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            if (!(i < m || j < m) && !viz[i][j])
            {
                ans++;
            }
        }
    }
    fout << ans;
}

int main()
{
    citire();
    solve();
    return 0;
}