1 import java.util.*;
 2 public class Main {
 3     public static void main(String[] args) {
 4         Scanner sc = new Scanner(System.in);
 5         int n = sc.nextInt();
 6         int m = sc.nextInt();
 7         char[] ch = {‘A‘,‘B‘,‘C‘,‘D‘,‘E‘,‘F‘,‘G‘,‘H‘,‘I‘,‘J‘,‘K‘,‘L‘,‘M‘,‘N‘,
 8                 ‘O‘,‘P‘,‘Q‘,‘R‘,‘S‘,‘T‘,‘U‘,‘V‘,‘W‘,‘X‘,‘Y‘,‘Z‘};
 9         String st = "";
10         for(int i=0;i<m;i++)
11             st += ch[i];
12         for(int i=0;i<n;i++){
13             String st1,st2;
14             if(i!=0){
15                 st1 = st.substring(0, st.length()-1);
16                 st2 = ch[i]+"";
17                 st = st2+st1;
18             }
19             System.out.println(st);
20         }
21     }
22 }