solution.java

// https://github.com/Utkarsh299-tech
import java.util.Scanner;

public class Solution {

 public static String getSmallestAndLargest(String s, int k) {
 String smallest = s.substring(0, k);
 String largest = s.substring(0, k);
 
 for(int i = 0; i <= s.length() - k; i++) {
 String curr = s.substring(i, i+k);
 if(smallest.compareTo(curr) > 0)
 smallest = curr;
 if(largest.compareTo(curr) < 0)
 largest = curr;
 }
 return smallest + "\n" + largest;
 }


 public static void main(String[] args) {
 Scanner scan = new Scanner(System.in);
 String s = scan.next();
 int k = scan.nextInt();
 scan.close();
 
 System.out.println(getSmallestAndLargest(s, k));
 }
}