import java.util.*;

class CompterMotsAvecVector {

    public static void main(String args[]) {
        StringTokenizer st = new StringTokenizer("this is this test");
	Vector vector = new Vector();
        while (st.hasMoreTokens()) {
            String motCourant = st.nextToken();
	    if (!vector.contains(motCourant)) {
		vector.add(motCourant);
	    }
	}
	Enumeration enum = vector.elements();
	while(enum.hasMoreElements()) {
	    System.out.print(enum.nextElement()+" ");
	}
	System.out.println();
    }
}