import sys

list1=[]
for line in sys.stdin:
    a = line.split()
    list1.append(a[0])

# 从第二个数据开始检查是否有重复 
list1=list1[1:]
list2=[]
for i in list1:
    if len(list2)==0 or (i not in list2):
        list2.append(i)

# str转化成int然后进行排序
list3=[]
for i in list2:
    list3.append(int(i))
list3.sort()

# 逐个输出
for i in list3:
    print(i)