#include <queue>
#include <iostream>
using namespace std;

int main(void) {
  priority_queue<string, deque<string>, less<string> > s;

  s.push( "aaa" );  s.push( "bb" );  s.push( "c" );
  while( ! s.empty() ){
    cout << s.top() << ' ';
    s.pop();
  }
  cout << endl;
  return 0;
}