#include<fstream>
using namespace std;
ifstream fin ("matrix.in");
ofstream fout ("matrix.out");

int n,m,s[1005][1005],sol,v[30],x;
bool ok[1005][1005];
int i,j,k;
char a[1005][1005],y;
int main () {
    fin>>m>>n;
    for (i = 1; i <= m; i ++) {
        for (j = 1; j <= m; j ++) {
            fin >> a[i][j];
            ok[i][j] = 1;
        }
    }
    for (i = 1; i <= n; i ++) {
        for (j = 1; j <= n; j ++) {
            fin >> y;
            v[y-'a'+1]++;
        }
    }
    for (k = 1; k <= 26; k ++) {
        for (i = 1; i <= m; i ++) {
            for (j = 1; j <= m; j ++) {
                s[i][j] = s[i-1][j] + s[i][j-1] - s[i-1][j-1];
                if (a[i][j] == k+'a'-1) {
                    s[i][j] ++;
                }
                x =s[i][j]-s[i-n][j]-s[i][j-n]+s[i-n][j-n];
                if (x!=v[k]) {
                    ok[i][j] = 0;
                }
            }
        }
    }
    for (i=1;i<=m;i ++) {
        for (j=1;j<=m;j++) {
            sol+=ok[i][j];
        }
    }

    fout << sol;
    return 0;
}