#include <iostream>
#include <locale>
#include <functional>
#include <algorithm>
#include <string>
 
std::string &stringToLower(std::string &str) {
  using namespace std::placeholders;   
  auto tolower_f = std::bind(std::tolower<char>, _1, std::locale());
 
  std::transform(str.begin(), str.end(), str.begin(), tolower_f);
  return str;
}
 
int main() {
  std::string str("AlA Ma koTa");
 
  std::cout << stringToLower(str);
 
  return 0;
}

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