#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n;
cin>>n;
int mid=(n+1)/2;
for (int i=1;i<=n;i++)
{
for (int j=1;j<=n;j++)
{
if(i<=mid&&j<=mid&&i+j==mid+1)cout<<"#";
else if(i<=mid&&j>=mid&&j-i==mid-1)cout<<"#";
else if(i>=mid&&j<=mid&&i-j==mid-1)cout<<"#";
else if(i>=mid&&j>=mid&&i+j==mid+n)cout<<"#";
else cout<<".";
}
cout<<endl;
}
return 0;
}