#include <iostream>
#include <fstream>

using namespace std;

char c;
char a[1001][1001];
int  sol, i, j, n, m, f[200];
int x[1001][1001];
int v[1001][1001];
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++)
            v[i][j] = 1;

    for (c = 'a'; c <= 'z'; c++)
    {
        for (i=1; i<=n; i++)
            for (j=1; j<=n; j++)
                if(a[i][j]==c)
                    x[i][j] = 1 + x[i-1][j] + x[i][j-1] - x[i-1][j-1];
                else
                    x[i][j] = 0 + x[i-1][j] + x[i][j-1] - x[i-1][j-1];
        for (i=m; i<=n; i++)
            for (j=m; j<=n; j++)
                if (x[i][j] - x[i-m][j] - x[i][j-m] + x[i-m][j-m] != f[c])
                    v[i][j] = 0;
    }

    for (i=m; i<=n; i++)
        for (j=m; j<=n; j++)
            sol += v[i][j];

    fout<<sol;

    return 0;
}