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