pyg = 'ay'
word = raw_input('Enter a word:')
if len(word) > 0 and word.isalpha():
    word = word.lower()
    first = word[0]
    if first in "aeiou":
        print (word + pyg)
    else:
        print (word[1:] + first + pyg)
else:
    print 'empty or not alpha'

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class myClass {
    public static void main(String[] args) throws IOException {
        String pyg="ay";
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a word: ");
        String word=reader.readLine();
        if (word.length() > 0 & isChar(word)) {
            word.toLowerCase();
            Character ch=word.charAt(0);
            if (ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u') {
                System.out.println(word + pyg);
            } else System.out.println( word.substring(1,word.length()) + ch + pyg);
        } else System.out.println("empty or not alpha");
    }
    public static boolean isChar(String word) {
        for(Character ch: word.toCharArray()) {
            if (!Character.isLetter(ch)) return false;
        }
        return true;
    }
}

Character ch=word.charAt(0);
if (ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u') { ...

Character ch=word.charAt(0);
if (ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u') { ...