#include <iostream>
using namespace std;

int main()
{
    int n,v[101]={0},x,i;
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>x,v[x]++;
    x=0;
    for(i=1;i<=100;i++)
    {
        if(v[i]==0)
        {
            x=1;
            if(v[i+1]==1)
                cout<<i<<"-"<<i<<'\n';
            else
            {
                cout<<i;
                while(v[i]==0)
                    i++;
                i--;
                cout<<"-"<<i<<'\n';
            }
        }
    }
    if(x==0)
        cout<<"All clear!";
    return 0;
}