Remove Duplicates from Sorted Array

Given a sorted array, remove duplicates in-place so each element appears only once. Return the new length and the modified array. Use two pointers: one for unique elements, one to scan. Example: [1,1,2] → length=2, array=[1,2,...]

Input

Line 1: n. Line 2: n space-separated sorted integers.

Output

Line 1: new length. Line 2: unique elements space-separated.

Sample

3
1 1 2

Expected

2
1 2