local n = io.read("*n")
local t = {}
local ans = {}
local ngcnt = {}
local idx = {}
for i = 1, n do
  ans[i] = 1000000007
  idx[i] = i
  ngcnt[i] = 0
  t[i] = {}
  for j = 1, n do
    t[i][j] = true
  end
end
for i = 1, n do
  local a = io.read("*n") + 1
  if a <= n then
    t[i][a] = false
    ngcnt[a] = ngcnt[a] + 1
  end
end
table.sort(idx, function(a, b) return ngcnt[a] < ngcnt[b] end)
if ngcnt[idx[n]] == n then
  print(-1)
  os.exit()
end
local function debug()
  print("---")
  for i = 1, n do
    for j = 1, n do
      io.write(t[i][j] and 1 or 0)
      io.write(j == n and "\n" or " ")
    end
  end
end
for i = 1, n do
  -- debug()
  local num = idx[#idx]
  for iuser = 1, n do
    if t[iuser][num] then
      ans[iuser] = num - 1
      for j = 1, n do
        if t[iuser][j] then
          ngcnt[j] = ngcnt[j] + 1
        end
        t[j][num] = false
        t[iuser][j] = false
      end
      break
    end
  end
  if i ~= n then
    table.remove(idx)
    table.sort(idx, function(a, b) return ngcnt[a] < ngcnt[b] end)
  end
end
print(table.concat(ans, "\n"))