#include <fstream>

using namespace std;
ifstream f("matrix.in");
ofstream g("matrix.out");
int n,m,s1,s2,nr,a[1001][1001],b[1001][1001];
int main()
{
    f>>n>>m;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
        {
            char c;
            f>>c;
            int x=c-'a'+1;
            a[i][j]=a[i-1][j]+a[i][j-1]-a[i-1][j-1]+x;
            b[i][j]=b[i-1][j]+b[i][j-1]-b[i-1][j-1]+x*x;
        }
    for(int i=1;i<=m;i++)
        for(int j=1;j<=m;j++)
    {
        char c;
        f>>c;
        int x=c-'a'+1;
        s1=s1+x;
        s2=s2+x*x;
    }
    for(int i=m;i<=n;i++)
        for(int j=m;j<=n;j++)
    {
        if(a[i][j]-a[i-m][j]-a[i][j-m]+a[i-m][j-m]==s1)
            if(b[i][j]-b[i-m][j]-b[i][j-m]+b[i-m][j-m]==s2)
                nr++;
    }
    g<<nr;
    return 0;
}