#include <iostream>
using namespace std;
int a[101];
int main() {
    int n;
    cin >> n;
    for(int i = 1; i<=n; i++)
        cin >> a[i];
        bool clear_=true;
    for(int i = 1; i<n; i++)
    if(a[i] != a[i + 1] - 1) {clear_ = false;
    break;
    }
    if(n == 100 && clear_ == true)
    {
        cout << "All clear!";
        return 0;
    }
    for(int i = 1; i<n; i++)
    {
        if(a[i] != a[i + 1] - 1)
            cout << a[i] + 1 << '-'<< a[i + 1] - 1 << '\n';
    }
    if(a[n] != 100) {cout << a[n] + 1 << '-' << "100";
    }
    return 0;
}