#include <locale>
#include <iostream>

int main()
{
    //std::setlocale(LC_ALL, "");
    std::locale::global(std::locale(""));

    std::locale loc = std::locale();

    std::cout << std::isalnum(L'Я', loc) << "\n";
    std::cout << std::isalnum(L'ל', loc) << "\n";
    std::cout << std::isalnum(L'¿', loc) << "\n";

}