#include <bits/stdc++.h>

using namespace std;

ifstream fin("matrix.in");
ofstream fout("matrix.out");
int n, m, i, j, fr[1002], d[1002][1002], r;
char c, a[1002][1002];
bool ok[1002][1002];

int main() {
    fin >> n >> m;
    for(i = 1; i <= n; i++) {
        for(j = 1; j <= n; j++) fin >> a[i][j];
    }

    for(i = 1; i <= m; i++) {
        for(j = 1; j <= m; j++) {
            fin >> c;
            fr[c - 'a']++;
        }
    }

    memset(ok, true, sizeof(ok));

    for(c = 'a'; c <= 'z'; c++) {
        for(i = 1; i <= n; i++) {
            for(j = 1; j <= n; j++) {
                d[i][j] = d[i - 1][j] + d[i][j - 1] - d[i - 1][j - 1] + (a[i][j] == c);
            }
        }

        for(i = m; i <= n; i++) {
            for(j = m; j <= n; j++) {
                if(d[i][j] - d[i][j - m] - d[i - m][j] + d[i - m][j - m] != fr[c - 'a']) ok[i][j] = false;
            }
        }
    }

    for(i = m; i <= n; i++) {
        for(j = m; j <= n; j++) r += ok[i][j];
    }
    fout << r;

    return 0;
}