#include<stdio.h>

#define NMAX 1002

int f[2][NMAX][NMAX][27];
char aux[NMAX];

void calc(int n,int tip)
{
    int i,j,l;

    for(i=1;i<=n;++i)
    {
        scanf("%s\n",aux+1);
        for(j=1;j<=n;++j)
        {
            for(l=0;l<=25;++l)
                f[tip][i][j][l]=f[tip][i-1][j][l]+f[tip][i][j-1][l]-f[tip][i-1][j-1][l];
            ++f[tip][i][j][aux[j]-'a'];
        }
    }
}

int main()
{
    freopen("matrix.in","r",stdin);
    freopen("matrix.out","w",stdout);
    int n,m,i,j,l,sol=0;

    scanf("%d%d\n",&n,&m);

    calc(n,0);
    calc(m,1);


    for(i=m;i<=n;++i)
    {
        for(j=m;j<=n;++j)
        {
            for(l=0;l<=25;++l)
                if(f[1][m][m][l] !=  f[0][i][j][l]-f[0][i-m][j][l]-f[0][i][j-m][l]+f[0][i-m][j-m][l] )
                    break;
            if(l==26)
                ++sol;
        }
    }

    printf("%d\n",sol);

    return 0;
}