import java.util.Scanner;
import java.io.PrintStream;

public class Test4D
{
   public static void main(String[] args)
   {
      PrintStream output = System.out;
      Scanner input = new Scanner(System.in);

      output.print("Enter a positive integer number: ");
      final int N = input.nextInt();

      output.print("Enter a character: ");
      String s = input.next();
      
      final char X = s.charAt(0);
      
      final int LAST = N - 1;
      for (int row = 0; row < N; row++)
      {
         if (row % 2 == 0)
         {
            output.print(X);
            for (int col = 1; col < LAST; col++)
            {
               output.print(" ");
            }
            if (N > 1)
            {
               output.print(X);
            }
         }
         else
         {
            for (int col = 0; col < N; col++)
            {
               output.print(X);
            }
         }
         output.println();
      }
   }
}