
Missing Numbers 
Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:1536KB 
Total submit users: 55, Accepted users: 34 
Problem 10050 :
No special judgement

Problem description 
Leo loves collecting numbers, he consumed half of his spare time and made a collection of all the numbers from 1 to n, one day, he decided to take out all the numbers he gathered and count them(a fantastic idea... ______b). when the counting was finished, he found that there are only n  2 numbers left, he can't memorize those numbers he already got, but still wonders which two numbers are missing.

Input 
The input file consists of several test cases. Each case starts with a line containing one integer n, 2 < n <= 2000000, Then followed n  2 lines, each line contains one exclusive integer k, 0 < k <= n.
The last line of 0 indicates the end of input which should not be processed.

Output 
For each test case, output a single line contains the two missing numbers in ascending order.

Sample Input 
3
2
5
1
5
3
0

Sample Output 
1 3
2 4

Judge Tips 
Huge input file, 'scanf'&'printf' recommended to avoid TLE.
MLE expected...

Problem Source 
HNU Contest

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