#include <iostream>

using namespace std;

int main() { 
	int n, a[101] = {0};
	cin >> n;
	if ( n == 100 ){ 
		cout << "All clear!\n";
		return 0;}
	for ( int i = 0; i < n; ++i ) 
		cin >> a[i];
	for ( int i = 1; i < n; ++i ) {
		if ( i == 1 ) {
			if ( a[i-1] != 1 ) 
				cout << 1 << '-' << a[i-1] - 1 << '\n';
			}
		else
		if ( a[i] - a[i-1] > 1 ) 
			cout << a[i-1] + 1 << '-' << a[i] - 1 << '\n';
	}
	if ( a[n-1] != 100 ) 
		cout << a[n-1] + 1 << '-' << 100;
	
}