// 2009 ACM Mid-Central USA Regional Programming Contest
// Solution to "E. Duplicate Removal" [easy]
// John Cigas
import java.io.*;
import java.util.Scanner;
public class dup {
public static void main( String[] args ) throws Exception {
Scanner in = new Scanner( new File( "dup.in" ) );
int N = in.nextInt();
while (N > 0) {
int P = in.nextInt();
for (int i=1; i<N; i++) {
int A = in.nextInt();
if (A != P)
System.out.print(P + " ");
P = A;
}
System.out.println(P + " $");
N = in.nextInt();
}
}
}
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