/******************************************************************************
 * This program strips an input stream of all non-alpha characters.
 * 
 * Copyright © 2017 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#include <clocale>
#include <codecvt>
#include <cwctype>
#include <iostream>
#include <string>

std::locale utf8loc(std::locale(), new std::codecvt_utf8<wchar_t>);
using namespace std;

int main(int argc, char **argv) {
    setlocale(LC_ALL, "en_US.UTF-8");
    wcout.imbue(utf8loc);
    wcin.imbue(utf8loc);

    int cp;
    while ((cp = getwchar()) != EOF) {
        if (iswalpha(cp)) {
            putwchar(cp);
        }
    }
    return 0;
}