Splitting the string removes the delimiter

When I am Splitting any string using the split() method then it is working good but the problem is that after splitting it removes the char that is used foe splitting

like

String str = 'abc-xyz-pqrs-zykp';

list<String>test = str.split('-');

Output : {abc,xyz,pqrs,zykp}

Actual outPut that I want : {abc,-xyz,-pqrs,-zykp};

I want this to be done without iterating the above list in a for loop.