#coding: UTF-8

import sys
import re
import itertools
from math import sqrt
from collections import deque

### defs ###

### main ###
S = sys.stdin.readline().strip('\r\n')

x,y=(0,0)
dir = {'N':(0,1), 'E':(1,0), 'W':(-1,0), 'S':(0,-1)}
for c in S:
	x += dir[c][0]
	y += dir[c][1]
print(sqrt(x*x+y*y))