#include <fstream>
using namespace std;
char c, a[1010][1010];
int d[1010][1010], sol, i, j, n, m, ok[1010][1010], f[130];
int main (){
    ifstream fin ("matrix.in");
    ofstream fout("matrix.out");
    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;
            f[c] ++;
        }
        for (i=m;i<=n;i++)
            for (j=m;j<=n;j++)
                ok[i][j] = 1;
    for (c = 'a'; c <= 'z'; c++){
        for (i=1;i<=n;i++)
            for (j=1;j<=n;j++)
                d[i][j] = (a[i][j] == c)
                + d[i-1][j] + d[i][j-1] - d[i-1][j-1];
            for (i=m;i<=n;i++)
                for (j=m;j<=n;j++)
                    if (d[i][j]-d[i-m][j]-d[i][j-m]+d[i-m][j-m] !=
                        f[c])
                        ok[i][j] = 0;
    }
    for (i=m;i<=n;i++)
        for (j=m;j<=n;j++)
            sol += ok[i][j];
    fout<<sol;
    return 0;
}