Java shorted Set
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) {
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());
}
}
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
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());
}
}
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