# coding=UTF-8:
import math
import collections

coordinates = str(input())

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

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

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