import java.util.*;

 public class Main {

     public static void main(String[] args) {

         Scanner sc = new Scanner(System.in);

         int n = sc.nextInt();

         int m = sc.nextInt();

         char[] ch = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N',

                 'O','P','Q','R','S','T','U','V','W','X','Y','Z'};

         String st = "";

         for(int i=0;i<m;i++)

             st += ch[i];

         for(int i=0;i<n;i++){

             String st1,st2;

             if(i!=0){

                 st1 = st.substring(0, st.length()-1);

                 st2 = ch[i]+"";

                 st = st2+st1;

             }

             System.out.println(st);

         }

     }

 }