y = read_line.delete('.').to_i
x = 1000
(y.gcd(x)).tap { |g| y //= g; x //= g }
char = if (x + y).even?
         'A'
       elsif x.odd?
         'B'
       else
         'C'
       end
cnt = x + y - 2
cnt += {0, (x - y) // 2}.max
cnt += {0, (x + y) // 2}.max
puts "#{char} #{cnt}"