#include <bits/stdc++.h>

using namespace std;

int N,x,y;
bool u = 0;
int main(){
	cin >> N;
	x = 0;
	while(N--){
		cin >> y;
		if(x+1 <= y-1){
			cout << x+1 << '-' << y-1 <<'\n';
			u = 1;
		}
		x = y; 
	}
	if(x+1 <= 100){ 
		cout << x+1 << '-' << 100 <<'\n';
		u = 1;
	}
	if(!u) cout << "All clear";
	return 0;
}