#include <iostream>
#include <clocale>
#include <cctype>
int main()
{
const wchar_t c = L'\u042f'; // cyrillic capital letter ya
std::setlocale(LC_ALL, "en_US.UTF8");
std::cout << "isalpha('Я') returned "
<< std::boolalpha << std::iswalpha(c) << '\n';
}
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