# using a dictionary
values = {}

x = input("Enter a number: ")
while (x != 0):
  values[x] = True  # Note that we can store any value we want into values[x]
                    # here since we just need to put the key into the 
		    # dictionary.  The actual value isn't important.
  x = input("Enter a number: ")
  
print "The unique values entered were:"
for i in values.keys():
  print i