#include <iostream>

using namespace std;

int main()
{
    int n,i,a,b,ok;
    cin>>n;
    ok=0;
    cin>>a;
    for(i=0;i<n-1;i++){
        cin>>b;
        if(b-a>1){
            ok=1;
            cout<<a+1<<"-"<<b-1<<endl;
        }
        a=b;
    }
    if(ok==0)
        cout<<"All clear!";
    return 0;
}