#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("matrix.in");
ofstream g("matrix.out");
int i,j,b1[1005][1005],b2[1005][1005],n,m,nr,s1,s2,x;
char c;
int main()
{f>>n>>m;
for(i=1;i<=n;i++)
    {for(j=1;j<=n;j++)
        {f>>c;
        x=(int)c-'a'+1;
        b1[i][j]=x+b1[i-1][j]+b1[i][j-1]-b1[i-1][j-1];
        b2[i][j]=x*x+b2[i-1][j]+b2[i][j-1]-b2[i-1][j-1];
        }
    }
for(i=1;i<=m;i++)
    {for(j=1;j<=m;j++)
        {f>>c;
        s1+=(int)c-'a'+1;
        s2+=(int)(c-'a'+1)*(c-'a'+1);
        }
    }
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
        if(b1[i][j]-b1[i-m][j]-b1[i][j-m]+b1[i-m][j-m]==s1 && b2[i][j]-b2[i-m][j]-b2[i][j-m]+b2[i-m][j-m]==s2)nr++;
        
g<<nr;
}