N = int(input())
P = list(map(int, input().split()))

pre = [-1] * (N + 1)
nex = [-1] * (N + 1)
for i in range(1, N - 1):
    pre[P[i]] = P[i - 1]
    nex[P[i]] = P[i + 1]
pre[P[-1]] = P[-2]
nex[P[0]] = P[1]

nil = 0
pre[P[0]] = nil
nex[P[-1]] = nil

res = []
for i in range(1, N + 1):
    if nex[i] == nil:
        continue
    res.extend([i, nex[i]])
    nex[pre[i]] = nex[nex[i]]
    pre[nex[nex[i]]] = pre[i]
    # 存在確認用
    nex[nex[i]] = nex[i] = nil

print(' '.join(map(str, res)))