def main():
    myStr = "Hello World"
    First3 = get3letter(mystr)

    myList = CreateList()
    newList = ProcessList(myList)


#1. Implement the following function, return the first three letters in your input string.
#   In this example, you should return "Hel"
def get3letter(input):


    return ""

#2. Create a list, add three elements to the list: "Hello", "CS", 144
#   return the created list
def CreateList():
    newlist=[]



    return newlist

#3. For the input myList, delete the first element, and add element "welcome" to it,
#   return the revised myList
def ProcessList(myList):


    return ""


# This is the standard boilerplate that calls the main() function.
if __name__ == '__main__':
    main()