import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
######################################################################
from sortedcontainers import SortedSet, SortedList, SortedDict
n = ni()
p = [x-1 for x in na()]
invp = [0]*n
for i in range(n):
    invp[p[i]] = i
s = SortedSet(list(range(n)))
removed = [0] * n
removed[p[-1]] = 1
last = n-1
t = 0
ans = []
for i in range(n//2):
    while removed[t]:
        t += 1
    removed[t] = 1
    ans.append(t+1)
    s.remove(invp[t])
    x = s.bisect_left(invp[t])
    y = p[s[x]]
    ans.append(y+1)
    removed[y] = 1
    s.remove(invp[y])
    if invp[y] == last and i < n//2-1:
        last = s[-1]
        removed[p[last]] = 1
        


print(*ans)