How to print a list of strings?
@E_garate By using for each activity.
Use a foreach,
In that put your list variable and in the Do use a writeLine or message box and put the item variable.
It will print your values one by one.
You cannot print the whole list as toString. 
More easy
String.Join(" ",YourList)
this will “dump” all list like " today tomorrow yesterday"
Use this one - String.Join(“,”,List)