n = int(input())
A = []
C = [0 for i in range(50)]
for _ in range(n):
    a = int(input())
    C[a] += 1
    A.append(a)
for i in range(n):
    if C[i] == n:
        print(-1)
        exit()

ANS = [i for i in range(n)]
for i in range(n):
    if ANS[i] == A[i]:
        if i < n - 1:
            ANS[i], ANS[i + 1] = ANS[i + 1], ANS[i]
        else:
            ANS[i], ANS[i - 1] = ANS[i - 1], ANS[i]
print(*ANS, sep='\n')