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import java.util.*;

class String21{

public static void main(String[] args){

Scanner s=new Scanner(System.in);

System.out.println("Enter string");

String str=s.next();

LinkedHashSet<Character> set=new LinkedHashSet<Character>();

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

set.add(str.charAt(i));

}

Iterator i=set.iterator();

while(i.hasNext()){

System.out.print(i.next());

}

}

}