Random order

      
int main() {
  using namespace std;

  string input = "1A 2B 3C 4D";
  stringstream ss(input);
  vector<string> tokens;
  while (ss.good()) {
    string text;
    ss >> text;
    tokens.push_back(text);
  }
  random_shuffle(tokens.begin(), tokens.end());
  stringstream result_ss;
  copy(tokens.begin(), tokens.end(), ostream_iterator<string>(result_ss, " "));
  string output = result_ss.str();
}