#coding:utf-8

from math import sqrt

S=raw_input()

x=0
y=0
for i in S:
	if i=='N':
		y+=1
	elif i=='S':
		y-=1
	elif i=='E':
		x+=1
	else:
		x-=1

ans=sqrt(pow(x,2)+pow(y,2))

print ans