[Tutor] Summing up numbers in a file

[masawudu bature]

How do I sum all occurrences of  a number in a file?
I have a file with a bunch of numbers, each on it's own line:

5
3
11
3
7
3
5
5
11
7
7
...
How do i sum them up so that the output will be ,
5 :  15
3 :   9
11:  22
7 :   21


      
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