n = gets.to_i
h = ([*?0..?9] + [*?A..?Z]).each_with_index.map{|a, b|[a, b]}.to_h
v = (0...n).map do
  s = gets.chomp
  d = h[s.chars.sort[-1]] + 1
  a = 0
  (0...(s.length)).each do |j|
    a *= d
    a += h[s[j]]
  end
  a
end
p v.sort[0]