Any improvements that I can make with this code? Also, is there another way to convert a vector to a string variable without using a for ranged-based loop? From the posts I've seen for converting, I only saw printing the vector instead of returning a string.

#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
#include <iterator>

std::string AlphabetSoup(string str) {
std::vector<char>letters;

 istringstream iss(str);

 copy(istream_iterator<char>(iss),
        istream_iterator<char>(),
        back_inserter(letters));

 std::sort(letters.begin(),letters.end());

 //Regrouping the characters into a string
 std::string orderedString;
 for(auto element : letters)
 {
     orderedString += element;
 }

 return orderedString;
}

Any improvements that I can make with this code? Also, is there another way to convert a vector to a string variable without using a for ranged-based loop? From the posts I've seen for converting, I only saw printing the vector instead of returning a string.

#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
#include <iterator>

using namespace std;

std::string AlphabetSoup(string str) {
std::vector<char>letters;

 istringstream iss(str);

 copy(istream_iterator<char>(iss),
        istream_iterator<char>(),
        back_inserter(letters));

 std::sort(letters.begin(),letters.end());

 //Regrouping the characters into a string
 std::string orderedString;
 for(auto element : letters)
 {
     orderedString += element;
 }

 return orderedString;
}