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/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>
using namespace std;
int main()
{
istream_iterator<string> cinPos(cin);
ostream_iterator<string> coutPos(cout," ");
/* while input is not at the end of the file
* - write every third string
*/
while (cinPos != istream_iterator<string>()) {
// ignore the following two strings
advance (cinPos, 2);
// read and write the third string
if (cinPos != istream_iterator<string>()) {
*coutPos++ = *cinPos++;
}
}
cout << endl;
}