Hit the nail on the head program in Java

24---Write a program to read a sentence which terminates with a full stop(.).The words are to
         be sperated by a single blank space and are in lower case.Arrange the words in ascending
         order according to the length of the words.If 2 words are of same length then the word
         occuring first in the input sentence should come first.For for input and output the
         sentence must begin with   upper case.
         SAMPLE INPUT : Hit the nail on the head.
         SAMPLE OUTPUT : On hit the the nail head.
import java.util.*;
class LengthWise{
    public static void main()
    {Scanner sc=new Scanner(System.in);
        String s,t,x="",y;
        int i,l;
        System.out.println("Enter a String");
        s=sc.nextLine();
        l=s.length();//finding length
        if(Character.toUpperCase(s.charAt(0))!=s.charAt(0)||s.charAt(l-1)!='.')
      System.out.println("The Sentence will start with a capital letter and end with a .");
      else{
            s=s.substring(0,l-1).toLowerCase();
            l=l-1;
            for(i=1;i<=l;i++){
                Scanner a=new Scanner(s);
                while(a.hasNext()){
                    t=a.next();
                    if(t.length()==i)
                    x=x+t+" ";//creating arranged string
                }
            }
            x=Character.toUpperCase(x.charAt(0))+x.substring(1,x.length()-1)+".";
            System.out.println("ARRANGED INCREASINGLY LENGTH WISE\n"+x);
        }
    }//end of main
}//end of class

OUTPUT---
Enter a String
Hit the nail on the head.
ARRANGED INCREASINGLY LENGTH WISE
On hit the the nail head.

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