cnt = int(input())
while True:
    if cnt >= 1 and cnt <= 1000:
        number = []
        for i in range(cnt):
            num = int(input())
            number.append(num)
        number = list(set(number))
        number.sort()
        for i in number:
            print(f"{i}")
        break
    else:
        cnt = int(input())