wordCount.hs
main = interact wordCount where wordCount input = show (length (words input)) ++ "\n"
Suppose input.txt has
following data.
input.txt
Friendship can turn into enmity, and enmity can become friendship. You all know — happiness can turn into sadness, and sadness can change into happiness. Although they are polar opposites, they are almost like twins, very close. Just a slight change in circumstances and one disappears …the other was just behind it. So remember the transcendent — existence belongs to the transcendental. Don’t divide it; otherwise you will be continuously tortured by the duality.
$ runghc wordCount < input.txt 74
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