inputFile $=$ input$("$Enter the input file name: $")$

inFile $=$ open$($inputFile$)$

uniqueWords $=[]$

# Iterate through each line in the file

for line in inFile:

# Split the line into words

words $=$ line.split$()$

# Iterate through each word in the line

for currentWord in words:

# Remove punctuation from the word

currentWord $=$ currentWord.strip$(\text{'},.?!\text{'})$

# Check if the word is not already in the list of unique words

if currentWord not in uniqueWords:

uniqueWords.append$($currentWord$)$

# Close the file

inFile.close$()$

# Sort the list of unique words

uniqueWords.sort$()$

# Print the sorted list of unique words

print$()$

for currentWord in uniqueWords:

print$($currentWord$)$