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It will work for all cases.
import java.io.;
import java.util.;
import java.text.;
import java.math.;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
Scanner scan=new Scanner(System.in);
String str=scan.next();
int k=scan.nextInt();
SortedSet<String> sets=new TreeSet<String>();
for(int i=0;i<=str.length()-k;i++){
sets.add(str.substring(i,i+k));
}
System.out.println(sets.first());
System.out.println(sets.last());
}
Java Substring Comparisons
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It will work for all cases. import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;
public class Solution {
}