while True:
    try:
        x1 = int(input())
        list1 = []
        list2 = []
        for i in range(x1):
            list1.append(int(input()))
        for word in list1:
            if word not in list2:
                list2.append(word)
        list2.sort()
        for k in list2:
            print(k)
    except:
        break