#line 1 "codes/Libraries/Core.hpp"



#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ull = unsigned long long;

#define rep(i,n) for(int i=0; i<n; i++)
#define rrep(i,n,s) for (int i=s; i<n; i++)


#line 2 "codes/E.cpp"

int main()
{
	int n;
	cin>>n;
	rep(i,n){
		rep(j,n){
			if(0<i&&(j==n-i||(j==n-i-1&&i<n-1)))cout<<"#";
			else cout<<".";
		}
		cout<<endl;
	}
}