A = [4, 15, 12, 5, 7, 15, 10, 5, 13, 8, 5, 7, 8, 1, 12, 7, 13, 12, 8]

A.sort()

print(A[0])
for i in range(1,len(A)):
    if A[i] != A[i-1]:
        print(A[i])