/******************************************************************************
Online Java Compiler.
Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.
*******************************************************************************/
public class Main
{
public static void main(String[] args) {
String str="welcometojava";
int k=3;
String smallest=str.substring(0,k);
String largest=str.substring(0,k);
Solution(smallest,k,largest,str);
}
static void Solution(String smallest,int k, String largest, String str)
{
String sub;
for(int i=1;i<=str.length()-k;i++){
sub=str.substring(i,i+k);
if(sub.compareTo(smallest)<0){
smallest=str.substring(i,i+k);
}
if(sub.compareTo(largest)>0){
largest=str.substring(i,i+k);
}
}
System.out.println(smallest+" "+ largest);
}
}
