Hi, 

Going through the '<-' description in 'learnouahaskell' it says - 

" If we have a Maybe String and we bind it with <- to a variable, that variable will be a String"

so if you write 

do

str <- Just "3"

str should be of type 'String'. My question is how do I return "34" by concatenating it to "4" because the following line of code fails - 

---

do

str <- Just "3"

return str++"4"::Maybe String

---

or for that matter how can I return/print just the value of str from this do block ?

Thanks,

Shishir 

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