// editor2
#include<iostream> 
using namespace std;
int main()
{
    int n;
    cin >> n;
    if(N <= 0) {
        cout << "Invalid input";
        return 0;
    }
    for (int i = 0; i < n; i++){
        for (int j = 0; j<N; j++); {
            if (i == j || i + j == N - 1)
                cout << "X";
            else 
                cout <<"D";
        }
        cout << endl;
    }
    return 0;
}