#!/usr/bin/python
# -*- coding: utf-8 -*-
import math

S = raw_input()
XY = [0,0]
for i in range(len(S)):
       	if S[i] == "N":
       		XY[1] += 1
       	elif S[i] == "S":
       		XY[1] -= 1
       	elif S[i] == "W":
       		XY[0] -= 1
       	elif S[i] == "E":
       		XY[0] += 1

print math.sqrt(XY[0]**2 + XY[1]**2)