#include <iostream>

using namespace std;

int main()
{
    int n, ok = 0, v[105];
    cin >> n;
    for(int i = 1; i <= n; ++i)
        cin >> v[i];
    v[n + 1] = 101;
    v[0] = 0;
    for(int i = 1; i <= n + 1; ++i)
        if(v[i] - v[i - 1] > 1){
            cout << v[i - 1] + 1 << "-" << v[i] - 1 << "\n";
            if(i != n)
            ok = 1;
        }
    if(!ok)
        cout << "All clear!";
    return 0;
}