PROGRAMMING:Cyclic structure prime judgment

Input an even number greater than 10 and output the minimum prime number greater than this number
###Input format:
Enter an even number greater than 10
###Output format:
Input legal data and output the minimum prime number greater than the input data.
If the input data is illegal, there is no output
###Input example:
```in
twelve
```
###Output example:
```out
thirteen
```







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