"""mutable.py
Demonstrate mutable objects and changin parameters.
"""

def upperList(words):
    for i in range(len(words)):
        words[i] = words[i].upper()

def main():
    seq = input("Enter a list of words ['...', '...', ...]: ")
    print "Here is the original list:"
    print seq
    upperList(seq)
    print "Here is the modified list, all in capital letters:"
    print seq

main()