#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
 
int main() {
 
	std::string s="абв.";
	std::cout << s.size() << std::endl;
 
	char a[3];
	a[0] = s[0];
	a[1] = s[1];
	a[2] = 0;
 
	std::cout << a << std::endl;
 
	std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> convert;
 
	std::u32string utf32 = convert.from_bytes(s);
 
	std::cout << utf32.size() << std::endl;
 
	std::u32string temp;
 
	for (int i= utf32.size() - 1; i > -1; i--) temp.push_back(utf32[i]);
 
	std::string utf8 = convert.to_bytes(temp);
 
	std::cout << utf8;
 
	return 0;
}

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