#include <fstream>

using namespace std;

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

char a[1005][1005],x;
int ok[1005][1005],d[1005][1005],f[30],n,m,i,j,sol,t;

int main()
{
    fin >> m >> n;
    for (i=1; i<=m; i++)
        for (j=1; j<=m; j++)
            fin >> a[i][j];
    for (i=1; i<=n; i++)
        for (j=1; j<=n; j++)
        {
            fin >> x;
            f[x-'a']++;
        }
    for (t=1; t<=26; t++)
    {
        for (i=1; i<=m; i++)
            for (j=1; j<=m; j++)
            {
                d[i][j] = d[i-1][j]+d[i][j-1]-d[i-1][j-1];
                if (a[i][j] == t+'a')
                    d[i][j]++;
            }
        for (i=n; i<=m; i++)
            for (j=n; j<=m; j++)
                if (d[i][j]-d[i][j-n]-d[i-n][j]+d[i-n][j-n] != f[t])
                    ok[i][j] = 1;
    }
    for (i=n; i<=m; i++)
        for (j=n; j<=m; j++)
            if (ok[i][j] == 0)
                sol++;
    fout << sol;
    return 0;
}