S = gets.chomp!
y = 0
x = 0
for i in 0...S.length
  if S[i] == "N"
    y += 1
  elsif S[i] == "E"
    x += 1
  elsif S[i] == "W"
    x -= 1
  else 
    y -= 1
  end
end
puts Math.sqrt(y*y+x*x)