Seperate Words of Non-Spaced Sentences

In this project I want you to simply take a txt file, read it, put spaces in between non-spaced words and rewrite the sentences in another txt file. For example your entry will be something like this "hellothisisasamplesentenceandiwantyoutoputspaces" and your output is expected to be "hello this is a sample sentence and i want you to put spaces". No UI needed.