import math

s = input()
hori = 0
vert = 0
for c in s:
  if c == 'N':
    vert += 1
  elif c == 'S':
    vert -= 1
  elif c == 'E':
    hori += 1
  elif c == 'W':
    hori -= 1
res = math.sqrt(hori**2 + vert**2)
print(res)