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