Need a script to make a number series

[deepanshu_here_2]

Hi All,

I have some numbers in a file as :
2
8
9
10
14
19
21
22
23
27

I want, if they 2 or more numbers are consecutive numbers, they should for a series like :
8-10
21-23

Thanks in advance.

Regards
Deepanshu Madan

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