[Haskell-cafe] can Haskell do everyting as we want?

As more I learn haskell, I am more interested in this function programming language. I am intended to more focus on haskell than other languages like python, Java, or C++. But I am still wonder whether haskell can do everyting as other languages do, such as python, perl, Java and C++. Is there anyone happen to come into any tasks that haskell is not able to achieve? Thanks. -- Qi Qi