#include<fstream>
using namespace std;
int n, m, i, j, i1, soll, s[1003][1003], sol[1003][1003];
char a[1003][1003], ch;
int xx[30];
ifstream in("matrix.in");
ofstream out("matrix.out");
int main(){
    in>>n>>m;
    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++)
            in>>a[i][j];
    for(i=1; i<=m; i++)
        for(j=1; j<=m; j++){
            in>>ch;
            xx[ch-96]++;
        }
    for(i1=1; i1<=26; i1++){
        for(i=1; i<=n; i++)
            for(j=1; j<=n; j++){
                s[i][j]=0;
                s[i][j]=s[i][j-1]+s[i-1][j]-s[i-1][j-1];
                if(a[i][j]==i1+96)
                    s[i][j]++;
                if(i>=m && j>=m){
                    if(s[i][j]-s[i][j-m]-s[i-m][j]+s[i-m][j-m]!=xx[i1])
                        sol[i][j]=1;
                }
            }
    }
    for(i=m; i<=n; i++){
        for(j=m; j<=n; j++){
            if(sol[i][j]==0)
                soll++;
        }
    }
    out<<soll;
return 0;
}