s = gets.chomp.split("")
x = 0
y = 0
s.each do |i|
  if i == "N"
    y += 1
  elsif i == "S"
    y -= 1
  elsif i == "E"
    x += 1
  elsif i == "W"
    x -= 1
  end
end
puts Math.sqrt(x**2 + y**2)