#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
for(int i = 1;i <= n;++i)
{
for(int j = 0;j < n-i;++j)
cout << "_";
for(int j = 0;j < i*2-1;++j)
cout << "*";
for(int j = 0;j < n-i;++j)
cout << "_";
cout << endl;
}
return 0;
}