import java.util.Scanner;

public class NkB {

   static char b; 
   static String n;
   static StringBuffer m = new StringBuffer();
   
   public static void number(int pos) {
      if (pos >= n.length()) {
         System.out.println(m);
      } else {
         for (char digit = '0'; digit < b; ++digit) {
            if (n.charAt(pos) != digit) {
               m.setCharAt(pos, digit);
               number(pos + 1);
            }
         }
      }
   }
   
   public static void main (String[] args) {
      Scanner in = new Scanner(System.in);

      n = in.next();
      int t = in.nextInt();
      b = (char)(t + '0');
      m.setLength(n.length());
      number(0);
   }
}