«Bersoft» company is working on a new version of its most popular text editor — Bord 2010. Bord, like many other text editors, should be able to print out multipage documents. A user keys a sequence of the document page numbers that he wants to print out (separates them with a comma, without spaces).

Your task is to write a part of the program, responsible for «standardization» of this sequence. Your program gets the sequence, keyed by the user, as input. The program should output this sequence in format l₁-r₁,l₂-r₂,...,l_k-r_k, where r_i + 1 < l_i + 1 for all i from 1 to k - 1, and l_i ≤ r_i. The new sequence should contain all the page numbers, keyed by the user, and nothing else. If some page number appears in the input sequence several times, its appearances, starting from the second one, should be ignored. If for some element i from the new sequence l_i = r_i, this element should be output as l_i, and not as «l_i - l_i».

For example, sequence 1,2,3,1,1,2,6,6,2 should be output as 1-3,6.