Problem 6112 --Be Unique (20)

## 6112: Be Unique (20)

Time Limit: 1 Sec  Memory Limit: 32 MB
Submit: 722  Solved: 445
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## Description

Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: one bets on a number chosen from [1, 104]. The first one who bets on a unique number wins. For example, if there are 7 people betting on 5 31 5 88 67 88 17, then the second one who bets on 31 wins.

## Input

Each input file contains one test case. Each case contains a line which begins with a positive integer N (<=105) and then followed by N bets. The numbers are separated by a space.

## Output

For each test case, print the winning number in a line. If there is no winner, print "None" instead.

## Sample Input

7 5 31 5 88 67 88 17
5 888 666 666 888 888

## Sample Output

31
None

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