$stdout.sync = true

S = "XXXXXXXXXX"
A = "XXXXXXXXXX"

for c in "0".."9" do
  for i in 0..9 do
    s = S.dup
    s[i] = c
    puts s
    res = gets
    A[i] = c if res[/\d+/].to_i > 0
  end
end

puts A