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#!/usr/bin/env ruby
input = gets.chomp.chars
units = input.map(&:downcase).uniq
lengths = {}
units.each do |unit|
polymer = input.dup
polymer.delete_if {|u| u == unit || u == unit.upcase}
l = polymer.length
loop do
i = polymer.length - 1
loop do
break if i < 1
if polymer[i] == polymer[i-1].swapcase
polymer.delete_at(i)
polymer.delete_at(i-1)
i -= 2
else
i -= 1
end
end
if polymer.length == l
break
else
l = polymer.length
end
end
lengths[unit] = polymer.length
end
puts lengths.values.min
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