/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String d = "hello";
 
		for(char c : d.toCharArray()) {
			if(isVowel(c)) {
				d = replaceVowel(d, c);
			}
		}
		System.out.println(d);
	}
 
	private static boolean isVowel(char c) {
		return "AEIOUaeiou".indexOf(c) != -1;
	}
 
	private static String replaceVowel(String original, char c) {
		String vowel = Character.toString(c);
		return original.replace(vowel, String.format("%1$sf%1$s",vowel));
	}
}

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