String LetterChanges(String str) { 

		int charnum;
		char charact;

		char[] charArray = str.toCharArray();
		for (int i = 0; i < charArray.length; i++) {
			charnum = (int) charArray[i];
			if (charnum >= 65 && charnum <= 91 || charnum >= 97 && charnum <= 122) {
				charnum += 1;
			}
			if (charnum == 91) {
				charnum = 65;
			}
			if (charnum == 123) {
				charnum = 97;
			}
			charact = new Character((char) charnum);
			if ("aeiou".indexOf(String.valueOf(charact)) > 0) {
				charnum -= 32;
				charact = new Character((char) charnum);
			}
			charArray[i] = new Character((char) charnum);

		}
		return new StringBuilder().append(charArray, 0, charArray.length).toString();
	}