s = io.read()
n = string.len(s)
x = 0
y = 0
for i = 1, n, 1 do
    c = string.sub(s, i, i)
    if c == "N" then y = y + 1 elseif c == "E" then x = x + 1 elseif c == "W" then x = x - 1 else y = y - 1 end
end
d = math.sqrt(x * x + y * y)
io.write(string.format("%.5f", d))