Java Substring Comparisons

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    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 s=scan.nextLine();
        int k=scan.nextInt();
        String min="zzz";
        String max="aaa";
        int y=k;
        for(int i=0;k<s.length();i++)
        {
            k=y+i;    
     //       System.out.println(s.substring(i,k));           
    
                if((s.substring(i,k)).compareTo(min)<0)
                    min=s.substring(i,k);
    
                if((s.substring(i,k)).compareTo(max)>0 )   
                    max=s.substring(i,k);
        }
    
      System.out.println(min);
    
     System.out.println(max);
    }
    

    }