#include <iostream>
#include <fstream>
#include <deque>
#include <algorithm>
#include <cmath>
#include <vector>
#include <climits>

#define DIM 1000

using namespace std;

//ifstream f("in.in");
//ofstream g("out.out");

ifstream f("matrix.in");
ofstream g("matrix.out");

int n,m,sol;
bool ok;
int a[DIM+5][DIM+5][30],v[30];
char c;

signed main()
{
    f>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            f>>c;
            for(int k=1;k<=26;k++){
                a[i][j][k] = a[i][j-1][k] + a[i-1][j][k] - a[i-1][j-1][k];
            }
            a[i][j][c-'a'+1]++;

        }
    }

    for(int i=1;i<=m;i++){
        for(int j=1;j<=m;j++){
            f>>c;
            v[c-'a'+1]++;
        }
    }

    /*for(int i=1;i<=4;i++){
        cout<<v[i]<<" ";
    }
    cout<<'\n'<<'\n';

    for(int k=1;k<=4;k++){
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                cout<<a[i][j][k]<<" ";
            }
            cout<<'\n';
        }
        cout<<'\n';
    }*/

    for(int i=m;i<=n;i++){
        for(int j=m;j<=n;j++){
            ok = 1;
            for(int k=1;k<=26;k++){
                if(a[i][j][k] - a[i][j-m][k] - a[i-m][j][k] + a[i-m][j-m][k] != v[k]){
                    ok = 0;
                    break;
                }
            }

            if(ok){
                //cout<<i<<" "<<j<<'\n';
                sol++;
            }
        }
    }

    g<<sol;

    return 0;
}