lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end

require "big"

s = read_line
g = s.chars.map(&.to_i).uniq.combinations(2).map { |(i, j)|
  9 * (i - j).abs
}.reduce(0) { |acc, x| acc.gcd(x) }

if g == 0
  puts s
else
  puts s.to_big_i.gcd(g)
end