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def list_manipulation(collection, command, location, value=None):
  '''
  list_manipulation([1,2,3], "remove", "end") # 3
  list_manipulation([1,2,3], "remove", "beginning") #  1
  list_manipulation([1,2,3], "add", "beginning", 20) #  [20,1,2,3]
  list_manipulation([1,2,3], "add", "end", 30) #  [1,2,3,30]
  '''
    if(command == "remove" and location == "end"):
        return collection.pop()
    elif(command == "remove" and location == "beginning"):
        return collection.pop(0)
    elif(command == "add" and location == "beginning"):
        collection.insert(0,value)
        return collection
    elif(command == "add" and location == "end"):
        collection.append(value)
        return collection