#include <stdio.h>
#include <stdlib.h>
	
int main(void) 
{
	int n, i;
	scanf("%d", &n);
	
	if (n == 100) {
		printf("All clear!");
		return 0;
	}

	int *v = malloc(n * sizeof(int));
	for (i = 0; i < n; i++) {
		scanf("%d", &v[i]);
	}
	
	int first = v[0], second = v[1];
	if (v[0] > 1) {	
		printf("%d-%d\n", 1, v[0] - 1);
	}	
	for (i = 1; i < n; i++) {
		if (second - first > 1) {
			printf("%d-%d\n", first + 1, second - 1);
		}
		first = second;
		second = v[i + 1];
	}
	if(v[n - 1] < 100) {
		printf("%d-%d\n", v[n - 1] + 1, 100);
	}
	free(v);
	
	return 0;
}