p2 = "ABACBC"
p3 = "ABACBACBC"
q = io.read("*n")
for iq = 1, q do
  n = io.read("*n")
  if n % 2 == 1 then
    io.write(p3)
    n = n - 3
  end
  n = math.floor(n / 2)
  print(string.rep(p2, n))
end