#include <fstream>
#include <bitset>
using namespace std;
ifstream fin ("matrix.in");
ofstream fout ("matrix.out");
bitset <1001> sol[1001];
int l,fr[26],sum,i1,j1,i2,j2,n,m,i,j,s[1001][1001];
short int v[1001][1001];
char ch;
int main ()
{
    fin>>n>>m;
    for (i=1; i<=n; i++)
    {
        for (j=1; j<=n; j++)
        {
            fin>>ch;
            v[i][j]=ch-'a';
            sol[i][j]=1;
        }
    }
    for (i=1; i<=m*m; i++)
    {
        fin>>ch;
        fr[ch-'a']++;
    }
    for (l=0; l<26; l++)
    {
        for (i=1; i<=n; i++)
        {
            for (j=1; j<=n; j++)
            {
                s[i][j]=s[i-1][j]+s[i][j-1]-s[i-1][j-1];
                if (v[i][j]==l)
                    s[i][j]++;
            }
        }
        for (i1=1; i1<=n-m+1; i1++)
        {
            for (j1=1; j1<=n-m+1; j1++)
            {
                i2=i1+m-1;
                j2=j1+m-1;
                sum=s[i2][j2]-s[i2][j1-1]-s[i1-1][j2]+s[i1-1][j1-1];
                if (sum!=fr[l])
                    sol[i][j]=0;
            }
        }
    }
    sum=0;
    for (i=1; i<=n-m+1; i++)
    {
        for (j=1; j<=n-m+1; j++)
            sum+=sol[i][j];
    }
    fout<<sum;
    return 0;
}