Every value in the array appears exactly twice except for two distinct values that each appear once. Find those two values and output them in ascending order.
Input format
Line 1: an integer n.
Line 2: n space-separated non-negative integers.
Output format
One line: the two singleton values, smaller first, separated by a space.
Constraints
- 2 <= n <= 100000, n is even
- 0 <= each value <= 1000000000