Pig Latin

[quietpupil]

Hi, I need help with my pig latin code. I know there's an answer to this on here already but I don't understand it. Also, I'm not allowed to use vectors; I have to use characters and strings. Anyway, my code seems to be in an infinite loop and I don't know how to fix it.

  #include <iostream>
#include <string>
#include <cctype>
using namespace std;

int main()
{
	string vowels = "aeiou";
	string uppervowels = "AEIOU";
	string words;
	string piggy = "";
	string message;
	string play = "N";
	
	do
	{
		cout << "Input your phrase to be translated:";
		getline(cin, message);
		if (message[0] == vowels[0] || message[0] == vowels[1] ||
			message[0] == vowels[2] || message[0] == vowels[3] ||
			message[0] == vowels[4])
		{
			words = message + "ay";
			piggy += words;
		}
		else if (message[0] == uppervowels[0] || message[0] == uppervowels[1] ||
			message[0] == uppervowels[2] || message[0] == uppervowels[3] ||
			message[0] == uppervowels[4])
		{
			words = message + "ay";
			piggy += words;
		}
		else if (message[0] != vowels[0] || message[0] != vowels[1] ||
			message[0] != vowels[2] || message[0] != vowels[3] ||
			message[0] != vowels[4])
		{
			words = message[1] + message[0] + "ay";
			piggy += words;
		}
		else if (message[0] != uppervowels[0] || message[0] != uppervowels[1] ||
			message[0] != uppervowels[2] || message[0] != uppervowels[3] ||
			message[0] != uppervowels[4])
		{
			words = message[1] + message[0] + "ay";
			piggy += words
		}
		cout << words << endl;
		cout << "Do you want to translate something? (Y or N)";
		getline(cin, play);
	} 
	while (play == "N");
	{
		cout << "Anksthay orfay Layingpay!"
	}
	return 0;
}