import java.util.Hashtable;

import java.util.Map.Entry;

class RemoveDuplicate

{

public static void removeDuplicate(String str){

str = str.toLowerCase();

str = str.replaceAll("\\s","");

char[] array = str.toCharArray();

System.out.println(String.valueOf(array));

Hashtable<Character,Integer> hst = new Hashtable<Character,Integer>();

char[] arr = new char[array.length];

int j = 0;

for(int i = 0 ; i < array.length ; i++){

if(hst.isEmpty()){

hst.put(array[i],1);

arr[j] = array[i];

j++;

}else if(hst.containsKey(array[i])){

System.out.println("Yes " + array[i]);

hst.put(array[i],hst.get(array[i]) + 1);

}else{

hst.put(array[i] , 1);

arr[j] = array[i];

j++;

}

}

System.out.println(String.valueOf(arr));

}

public static void main(String[] args)

{

String str = "vishal Singh";

removeDuplicate(str);

}

}