#include <fstream>
using namespace std;
ifstream cin("matrix.in");
ofstream cout("matrix.out");
char c, a[1010][1010];
int d[1010][1010], sol, i, j, n, m, ok[1010][1010], f[130];
int main (){


    cin>>n>>m;
    for (i=1;i<=n;i++)
        for (j=1;j<=n;j++)
            cin>>a[i][j];
    for (i=1;i<=m;i++)
        for (j=1;j<=m;j++) {
            cin>>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];

    cout<<sol;

    return 0;
}