import java.util.HashSet;
import java.util.Scanner;
public class Main {
	public static void main(String[] a) {
		try (Scanner in = new Scanner(System.in)) {
			while (in.hasNext()) {
				String line = in.nextLine().replace("[", "").replace(",", "").replace("]", "");
				System.out.println(line + " -> " + parseLine(line));
			}
		}
	}
	public static boolean parseLine(String line) {
		boolean flag = false;
		try (Scanner in = new Scanner(line)) {
			HashSet<Integer> set = new HashSet<>();
			while (in.hasNext()) {
				int x = in.nextInt();
				if (x==0 || !set.add((x<0)?(-x):(x))) {
					flag = true;
					break;
				}
			}
		}
		return flag;
	}
}