#sorry
def main
  s = gets.chomp

  x = Time.now()

  def gcd(a,b)
    if b!=0 then
      return gcd(b, a%b)
    else
      return a
    end
  end

  len = s.length

  if len == 1 then
    puts s
    return
  end
  g = s.to_i
  n = g

  while true 
    y = Time.now()
    if y-x > 0.400 then
      break
    end
    for i in 0..10 do
      a = rand(0...len)
      b = rand(0...len)
      u = (n/(10**a))%10
      v = (n/(10**b))%10

      n = n + (v-u)*(10**a) + (u-v)*(10**b)
      g = gcd(g, n)
    end
    if g == 1 then
      break
    end
  end

  puts g
end

main()