import java.util.Scanner;

public class prog{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		int N = scn.nextInt();
		int[] arr = new int[N];
		for (int i = 0; i < N; i++) {
			arr[i] = scn.nextInt();
		}
		boolean check = true;
		if (N == 1) {
			int a = arr[0];
			if (a != 1 && a != 100) {
				System.out.println(1 + "-" + (a - 1));
				System.out.println(a + 1 + "-" + 100);
			} else if (a == 1) {
				System.out.println(a + 1 + "-" + 100);
			} else {
				System.out.println(1 + "-" + 99);
			}
			check = false;
		} else {
			for (int i = 0; i < N - 1; i++) {
				int a = arr[i];
				int b = arr[i + 1];
				if (i == 0) {
					if (a != 1) {
						System.out.println(1 + "-" + (a - 1));
					}
				}
				if (b - a > 1) {
					System.out.println(a + 1 + "-" + (b - 1));
				}
				if (i == N - 2) {
					if (b != 100) {
						System.out.println(b + 1 + "-" + 100);
					}
				}
			}
			check = false;
		}
		if (check) {
			System.out.println("All clear!");
		}
	}

}