//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<n;i++)

{

a[i]=str.nextToken();

}

for(i=0;i<n;i++)

{

b=a[i].length();

char x=a[i].charAt(0);

if(b>1)

{

char y=a[i].charAt(b-1);

s1=y+a[i].substring(1,(b-1))+x;

}

else

{

s1=s1+x;

}

c[k]=s1;

k++;

s1="";

}

for(i=0;i<n;i++)

{

System.out.println(c[i]);

}

}

}