# input
N = gets.to_i
A = N.times.map{
      gets.to_i
    }

def check_nums nums
  nums.index.with_index{|num, i| num == A[i]}
end

def change_nums nums, index
  i = ((0...nums.size).to_a - [index]).sample
  nums[index], nums[i] = nums[i], nums[index]
end

if (!A.any?{|i| i >= N } && A.uniq.size == 1)
  p -1
else
  nums = (0...N).to_a.shuffle
  while (ng = check_nums(nums)) != nil
    change_nums nums, ng
  end
  nums.each{|i| p i }
end