import java.util.*;

public class exercise2 {
    public static void main(String[] args){
        Set set = new LinkedHashSet();
        String string = "wwqweqdasdafdsfdsferer";
        char[] ch = string.toCharArray();
        for(int i = 0; i < ch.length; i++){
            set.add(ch[i]);
        }
        System.out.println(set);
        }

    }

//OutPut:

[w, q, e, d, a, s, f, r]