# Arup Guha
# 3/29/2020
# Basic use of a single set (ignoring duplicates).

n = int(input("Enter the number of items you bought.\n"))

# Add each item.
items = set()
print("Please enter each item, one per line.")
for i in range(n):
    item = input("")
    items.add(item)

# Print the unique items.
print("You have",len(items),"unique items.")
print("They are ", end="")
for x in items:
    print(x, end = " ")
print()