#Open the file romeo.txt and read it line by line.
# For each line, split the line into a list of words using the split() method.
# The program should build a list of words. For each word on each line check
# to see if the word is already in the list and if not append it to the list.
# When the program completes, sort and print the resulting words in alphabetical order.
fname=input("Enter the file name: ")
fh=open(fname)
lst = list()
for line in fh:
for i in line.split():
if not i in lst:
lst.append(i)
print(sorted(lst))
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