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

public class Test4B
{
   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 two character pattern: ");
      final String PATTERN = input.next();
      
      final char X = PATTERN.charAt(0);
      final char Y = PATTERN.charAt(1);
      
      for (int row = 0; row < N; row++)
      {
         char c = X;
         if (row % 2 == 1)
         {
            c = Y;
         }
         
         for (int col = 0; col < N; col++)
         {
            output.print(c);
            if (c == X)
            {
               c = Y;
            }
            else
            {
               c = X;
            }
         }
         
         output.println();
      }
   }
}