HackerRank_StringComparison.java

import java.util.Scanner;
public class HackerRank_StringComparison {
    
    public static String getSmallestAndLargest(String s, int k) {

    String s1 = s.substring(0, k);
    String smallest = s1;
    String largest = s1;

    // Complete the function

    for(int i = 1; i <= (s.length() - k); i++){
        s1 = s.substring(i, (i + k));

        if(s1.compareTo(smallest) < 0){
            smallest = s1;
        }
        if(s1.compareTo(largest) > 0){
            largest = s1;
        }            
    }

    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));
    }
}