#include <iostream>
#include <fstream>
using namespace std;
ifstream f("date.in");
ofstream g("date.out");
int main()
{
    int n,i,a,b,ok;
    f>>n;
    ok=0;
    f>>a;
    for(i=0;i<n-1;i++){
        f>>b;
        if(b-a>1){
            ok=1;
            g<<a+1<<"-"<<b-1<<endl;
        }
        a=b;
    }
    if(b<100){
        ok=1;
        g<<b+1<<"-"<<100;
    }
    if(ok==0)
        g<<"All clear!";
    return 0;
}