s=gets.chomp
if s.length == 1
  puts s
  exit
end
a=[]
(0..10).each{|i|a[i]=0}
(0...s.length).each do |i|
  a[s[i].to_i] += 1;
end
if(a.sort[-2]==0)
  puts s
  exit
end
g = s.to_i
(0..8).each do |i|
  ((i+1)..9).each do |j|
    if(a[i]*a[j]>0)
      g = g.gcd(9*(j-i))
    end
  end
end
puts g