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#!/usr/bin/env ruby
input = gets.chomp.chars
polymer = input
nextpolymer = Array.new(polymer.length)
nextpolymer[0] = polymer[0]
index = 1
nextindex = 0
while index < polymer.length do
if polymer[index].swapcase != nextpolymer[nextindex]
nextindex += 1
nextpolymer[nextindex] = polymer[index]
else
nextpolymer[nextindex] = nil
nextindex -= 1
end
index += 1
end
puts nextpolymer.compact.length
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