#sorry
def main
  s = gets.chomp

  x = Time.now()

  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 > 0.200 then
      break
    end
    if g == 1 then
      break
    end
    for i in 0..10 do
      for j in 0...5 do
        a = rand(0...len)
        b = rand(0...len)
        u = (n % (10**(a+1)) / (10**a))
        v = (n % (10**(b+1)) / (10**b))

        n = n + ((v-u)*(10**a)) + ((u-v)*(10**b))
      end
      if g != n then
        g = g.gcd(n)
      end
    end
  end

  puts g
end

main()