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Haskell, 43 35 bytes main=interact$("Hello, "++).(++"!") Try it online!
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#2: Post edited
# [Haskell], 43 bytes- <!-- language-all: lang-hs -->
main=getLine>>=putStr.("Hello, "++).(++"!")[Try it online!][TIO-kt9wwf6l]- [Haskell]: https://www.haskell.org/
[TIO-kt9wwf6l]: https://tio.run/##y0gszk7Nyfn/PzcxM882PbXEJzMv1c7OtqC0JLikSE9DyQMom6@joKStramnoa2tpKik@f@/X2JuKgA "Haskell – Try It Online"
- # [Haskell], <del>43</del> 35 bytes
- <!-- language-all: lang-hs -->
- main=interact$("Hello, "++).(++"!")
- [Try it online!][TIO-kt9xbmas]
- [Haskell]: https://www.haskell.org/
- [TIO-kt9xbmas]: https://tio.run/##y0gszk7Nyfn/PzcxM882M68ktSgxuURFQ8kDKJqvo6Ckra2pp6GtraSopPn/v19ibioA "Haskell – Try It Online"
#1: Initial revision
# [Haskell], 43 bytes <!-- language-all: lang-hs --> main=getLine>>=putStr.("Hello, "++).(++"!") [Try it online!][TIO-kt9wwf6l] [Haskell]: https://www.haskell.org/ [TIO-kt9wwf6l]: https://tio.run/##y0gszk7Nyfn/PzcxM882PbXEJzMv1c7OtqC0JLikSE9DyQMom6@joKStramnoa2tpKik@f@/X2JuKgA "Haskell – Try It Online"