#include <iostream>

using namespace std;

int v[101], i, n;

int main()
{
    cin >> n;

    for(i = 1; i <= n; i++)
        cin >> v[i];

    if(n == 100)
        cout << "All clear!";

    else
    {
        if(v[1] != 1)
            cout << 1 << "-" << v[1] - 1 << "\n";

        for(i = 2; i <= n; i++)
        {
            if(v[i] - v[i-1] != 1)
                cout << v[i-1] + 1 << "-" << v[i] - 1 <<"\n";
        }

        if(v[n] != 100)
            cout << v[n] + 1 << "-" << 100<< "\n";
    }
}