defmodule Main do
  def main do
    n = ii()
    ans = for i <- 0..n-1 do
      s = String.codepoints(input())
      if Enum.at(s, i) == "a", do: "b", else: "a"
    end

    IO.puts ans
  end

  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: (if b, do: "Yes", else: "No")
end