Remove-Erase Idioma

    string str_demo("AABBBCCC11AAAFF%%%777AGFGFG");
    string::iterator res;
    res = remove_if(str_demo.begin(), str_demo.end(),
        not1(ptr_fun(isdigit)));
    str_demo.erase(res, str_demo.end());
    cout << str_demo;