#include <fstream>
#define DIM 1010
using namespace std;
ifstream fin("matrix.in");
ofstream fout("matrix.out");
int n,m,i,j,sol,f[DIM];
char ch[DIM][DIM],x;
int ok[DIM][DIM],d[DIM][DIM]; //d[i][j]=de cate ori apare un caracter in submatricea
int main() { 				  //de dimensiuni m*m cu coltul din dreapta jos in i,j
	fin>>n>>m;
	for (i=1;i<=n;i++)
		for (j=1;j<=n;j++)
			fin>>ch[i][j];
	for (i=1;i<=m*m;i++) {
		fin>>x; f[x]++;
	}
	for (i=m;i<=n;i++) //daca matricea de dimensiuni m*m cu coltul din
		for (j=m;j<=n;j++) //dreapta jos in i,j se regaseste in matricea ch
			ok[i][j]=1;
	for (char c='a';c<='z';c++) {
		for (i=1;i<=n;i++)
			for (j=1;j<=n;j++)
				d[i][j]=(ch[i][j]==c)+d[i][j-1]+d[i-1][j]-d[i-1][j-1];
		for (i=m;i<=n;i++)
			for (j=m;j<=n;j++) {
				int F=d[i][j]-d[i-m][j]-d[i][j-m]+d[i-m][j-m];
				if (F!=f[c])
					ok[i][j]=0;
			}
	}
	for (i=m;i<=n;i++)
		for (j=m;j<=n;j++)
			sol+=ok[i][j];
	fout<<sol;
	return 0;
}