# coding=UTF-8:
import math
import collections

coordinates = str(input())

keys = ['N', 'S', 'E', 'W']
values = [0, 0, 0, 0]
dMaster = dict(zip(keys, values))

cCounter = collections.Counter(coordinates)
cDict = dict(cCounter)

for k in cDict.keys():
    dMaster[k] = cDict[k]

moveA = abs(dMaster['E'] - dMaster['W'])
moveB = abs(dMaster['N'] - dMaster['S'])

ans = math.sqrt(moveA ** 2 + moveB ** 2)
print(round(ans, 5))