What are the four crypto currencies that I should buy and keep untouched for at least five years?
In my own opinion, it would bitcoin. Since bitcoin is the most long running coin of all time; I think that it is hard for other coins to defeat it. And also it will still useful after five years since many people are starting to invest with it. For the other three it is up to you to decide, but all I can say that always put bitcoin on the top of your list.