Two numbers that appear once

Problem

In a list of readings, exactly two values appear once and every other value appears twice. Print the two single values, the smaller first.

Example

Input

6
1 2 1 3 2 5

Output

3 5

The values 3 and 5 appear once.

Try the problem first. Open one hint at a time.

Hint 1

XOR all the values: the pairs vanish and you get a ^ b, which is not 0.

Hint 2

A set bit in a ^ b is a bit where a and b differ. Use it to split the values into two groups, and XOR each group.

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