#include <string.h>
#include <iostream.h>

class Exchange
{
public:
string sent, rev;
int size = 0;

Exchange(); 

void readsentence();

void exfirstlast();

void display();


Exchange::Exchange()
{
	sent = L"";
	rev = L"";
	size = 0;
}

void Exchange::readsentence()
{
	cout <<"Enter a sentence : ";
	sent = readLine();
	size = sent.length();
	if (sent[size-1] != '.')
	sent = sent + L".";
	size = size+1;
}

void Exchange::exfirstlast()
{
	string s1 = L"";
	wchar_t ch;
	for (int i = 0;i < size;i++)
	{
	  ch = sent[i];
	  if (ch != L' ' && ch != L'.')
	  {
		 s1 = s1 + StringHelper::toString(ch);
	  }
	  else 
	  {
	   int l = s1.length();
	   for (int j = 0;j < l;j++)
	   {
		 if (j == 0) 
		 {
			ch = s1[l - 1];
		 }
		 else if (j == (l - 1)) 
		 {
			ch = s1[0];
		 }
		 else
		 {
			ch = s1[j];
		 }
		 rev = rev + String(ch);
	   }
	   rev = rev + L" ";
	   s1 = L""; 
	  }
	}
}

void Exchange::display()
{
	cout <<"The Original Sentence is : " << sent <<endl;
	cout <<"The Changed Sentence is : " << rev <<endl;
}

void Exchange::main(std::vector<string> &args) throw(IOException)
{
	Exchange *ob = new Exchange();
	ob->readsentence();
	ob->exfirstlast();
	ob->display();
}