PROGRAMMING:Number of single

"This problem will come out in the time of changing women's clothes."
Zup gives you 2n + 2 numbers each time. Except for two of them, every other number appears twice. Find these two numbers and output them in ascending order.
Among them:
2<=n<=50000
###Input format:
Enter 2n + 2 numbers
###Output format:
Ascending output does not appear twice these two numbers
###Input example:
Here is a set of inputs. For example:
```in
1 2 2 3 4 4 5 3
```
###Output example:
The corresponding output is given here. For example:
```out
1 5
```







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