// collect words from keyboard until 'END' is typed.
#include <iostream>
#include <string>
#include <vector>
#include <exception>
#include <algorithm>
#include <cctype>


int main()
{

std::string const end_input("END");
std::vector<std::string> words;
std::string aword;
bool reject = false;

try{
    while(aword != end_input)
    {
        std::cout << "Please input a word. (input END to end input). \n";
        std::cin >> aword;
        for(int index(0); index < aword.length() && not reject; index++)
        {
            if(isalpha(aword[index]))
            continue;

            else

            reject = true;
        }

        if(reject) throw std::exception();
        words.push_back(aword);
    }

    std::cout << "These are your words in alphabetical order.\n";

    std::sort(words.begin(), words.end());

    for(int i(0); i != words.size(); ++i)
    {
    std::cout << words[i] << '\n';
    }


}

catch(...)
{
    std::cerr << "***An exception was thrown ***\n";
}

}