import java.util.*;
public class nonuniquetwo {
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
String sentence = sc.nextLine();
String[] words = sentence.split(" ");
for(String word : words)
{
System.out.print(getUnique(word) + " ");
}
sc.close();
}
public static String getUnique(String str)
{
StringBuffer sb = new StringBuffer();
for(int i = 0; i<str.length(); i++)
{
if(countFrequency(str.charAt(i), str) == 1)
{
sb.append(str.charAt(i));
}