#include <stdio.h>
#include <stdlib.h>
void freq_array_fill(int n,int v[100])
{
    int i,x;
    for(i = 0 ; i < n ;i++)
    {
        scanf("%d",&x);
        v[x] = 1;
    }
}
void gap_finder(int v[100])
{
    int i = 1,a,b,t = 0;
    while(i <= 100)
    {
        if(v[i] == 0)
        {
            t = 1;
            a = i;
            b = i;
            while(v[i] == 0)
            {
                i++;
            }
            b = i - 1;
            printf("%d-%d\n",a,b);
        }
        i++;
    }
    if(t == 0)
        printf("All clear!");
}
int main()
{
    int n,v[100] = {0};
    scanf("%d",&n);
    freq_array_fill(n,v);
    gap_finder(v);
    return 0;
}