A student of z-school found a kind of sorting called z-sort. The array a with n elements are z-sorted if two conditions hold:
ai \ge ai-1 for all even i, ai \le ai-1 for all odd i \gt 1.
For example the arrays [1,2,1,2] and [1,1,1,1] are z-sorted while the array [1,2,3,4] isn’t z-sorted.

Can you make the array z-sorted?

The first line contains a single integer n (1 \le n \le 1000) - the number of elements in the array a.

The second line contains n integers ai (1 \le ai \le 109) - the elements of the array a.

If it's possible to make the array a z-sorted print n space separated integers ai - the elements after z-sort. Otherwise print the only word "Impossible".