#include <fstream>
#define letters 26
#define DIM 1001

using namespace std;

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

int n, m;
short int virus[letters];
short int sp[letters][DIM][DIM];
int sol;
char s;

int main()
{
    fin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            fin >> s;
            for (int letter = 0; letter < letters; letter++) {
                sp[letter][i][j] = sp[letter][i - 1][j] + sp[letter][i][j - 1] - sp[letter][i - 1][j - 1];
            }
            sp[s - 'a'][i][j]++;
        }
    }
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= m; j++) {
            fin >> s;
            virus[s - 'a']++;
        }
    }
    for (int i = m; i <= n; i++) {
        for (int j = m; j <= n; j++) {
            bool correct = true;
            for (int letter = 0; letter < letters; letter++) {
                int currentLetterCount = sp[letter][i][j] - sp[letter][i - m][j] - sp[letter][i][j - m] + sp[letter][i - m][j - m];
                if (virus[letter] != currentLetterCount) {
                    correct = false;
                    break;
                }
            }
            if (correct)
                sol++;
        }
    }
    fout << sol;
}