#include <fstream>
#define dim 1001
using namespace std;
int a[dim][dim], d[dim][dim], n, m, i, j, sol[dim], SOL, t, ii, jj;
bool ok[dim][dim];
char c;
int main ()
{
    ifstream fin ("matrix.in");
    ofstream fout ("matrix.out");
    fin>>m>>n;
    for (i=1; i<=m; i++)
        for (j=1; j<=m; j++)
        {
            fin>>c;
            a[i][j]=c-'a';
        }
    for (i=1; i<=n; i++)
    for (j=1; j<=n; j++)
    {
        fin>>c;
        sol[c-'a']++;
    }
    for (t=0; t<='z'-'a'; t++)
    {
        for (i=1; i<=m; i++)
            for (j=1; j<=m; j++)
                d[i][j]=d[i][j-1]+d[i-1][j]-d[i-1][j-1]+(t==a[i][j]);
        for (i=1; i<=m-n+1; i++)
            for (j=1; j<=m-n+1; j++)
            {
                ii=i+n-1;
                jj=j+n-1;
                if (d[ii][jj]-d[i-1][jj]-d[ii][j-1]+d[i-1][j-1]!=sol[t])
                    ok[i][j]=1;
            }
    }
    for (i=1; i<=m-n+1; i++)
        for (j=1; j<=m-n+1; j++)
            if (ok[i][j]==0)
                SOL++;
    fout<<SOL;
}