//swap_first_and_last_letter_of_each_word 

import java.util.*;
public class swap_first_and_last_letter_of_each_word 
{
    public static void main()
    {
        Scanner ob=new Scanner(System.in);
        System.out.println("enter string");
        String s=ob.nextLine();
        StringTokenizer str=new StringTokenizer(s," ,.,?,!");
        int n=str.countTokens();
        String a[]=new String[n];
        int i,b,k=0;String c[]=new String [n];String s1="";
        for(i=0;i