import math
d = input()
n = 0
e = 0
w = 0
s = 0
for i in d:
  if i == "N":
    n += 1
  elif i == "E":
    e += 1
  elif i == "W":
    w += 1
  else:
    s += 1

print(math.sqrt(abs(n-s)**2 + abs(w-EOFError)**2))