import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);


        int number = sc.nextInt();
        sc.nextLine();
        String key1 = sc.nextLine();
        char char1=key1.charAt(0);
        char char2=key1.charAt(2);



        if(char1<char2){
            char temp=char1;
            char1=char2;
            char2=temp;
        }

        StringBuilder str = new StringBuilder();
        int c= (int) Math.pow(2, number);
        for (int i = 0; i < c; i++) {
            if (Integer.toBinaryString(i).length() < number) {
                for (int j = 0; j < number - Integer.toBinaryString(i).length(); j++) {
                    str.append("0");
                }
            }
            str.append(Integer.toBinaryString(i));
            System.out.println(str.toString().replace('1', char1).replace('0', char2));
            str.setLength(0);
        }
    }
}