/*
 * Standard containers, std::vector, exercise 4.
 */
#include <algorithm>
#include <functional>
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <cctype>
using namespace std;
using namespace std::placeholders;

struct first_character_equal
{
   bool operator()(const string& first, const string& second) const
   {
      for (auto c : second)
      {
	 if (tolower(first[0]) == tolower(c))
	    return true;
      }
      return false;
   }

   typedef bool   result_type;
   typedef string first_argument_type;
   typedef string second_argument_type;
};

int main()
{
   vector<string> cars{ istream_iterator<string>(cin), istream_iterator<string>() };

   sort(begin(cars), end(cars));

   copy_if(begin(cars), end(cars), ostream_iterator<string>(cout, "\n"),
	   bind(first_character_equal(), _1, "abc"));

   return 0;
}