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
n = s.size
if s.count(s[0]) == n
  puts s
  exit
end

p (0...n).to_a.combinations(2).map { |(i, j)|
  ("#{s[i]}#{s[j]}".to_i - "#{s[j]}#{s[i]}".to_i).abs
}.reduce(0) { |i, j| i.gcd(j) }.gcd(s.to_i)