#!/usr/bin/env python3
#fileencoding: utf-8
from math import sqrt

S = input()
d = [0,0]
way = {"N":1,"E":1,"W":-1,"S":-1}
for i in S:
    if i == "N" or i == "S":
        d[0] += way[i]
    elif i == "E" or i == "W":
        d[1] += way[i]
print(sqrt(d[0]**2+d[1]**2))