#CSC140 10-7-19 TdeL
#Remove duplicates
infile=open("classlist.txt", "r")
outfile=open("nodups.txt", "w")

aline = infile.readline()
#print(aline)

newlist = []
for aline in infile:
    if aline not in newlist:
        newlist = newlist + [aline]
        outfile.write(aline)
#print(newlist)

infile.close()
outfile.close()