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