while True: n_list = [] try:

    insert_str = input()
    for j in range(int(insert_str)):
        next_str = input()
        
        n_list.append(int(next_str))
    n_list = list(set(n_list))
    n_list.sort()
    for i in n_list:
        print(i)
except Exception as a:
    break

alt