#include <iostream>
using namespace std;
int v[101],n;


void citire()
{   int i,a;
    cin >> n;
    for(i=1;i<=n;i++)
        {cin >> a;
        v[a]=1;
        }
}

void afisare()
{   int i,a,b;
    bool ok=0;
    for(i=1;i<=100;i++)
        if(!v[i])
            {ok=1;
            a=i;
            while(!v[i+1])
                i++;
            b=i;
            cout << a << '-' << b << '\n';
            }
    if(!ok)
        cout << "All clear!\n";

}

int main()
{   citire();
    afisare();
    return 0;
}