/* -*- coding: utf-8 -*-
 *
 * 113.cc: No.113 宝探し - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  string s;
  cin >> s;
  int n = s.size();

  int x = 0, y = 0;
  for (int i = 0; i < n; i++)
    switch (s[i]) {
    case 'N': y++; break;
    case 'E': x++; break;
    case 'W': x--; break;
    case 'S': y--; break;
    }

  printf("%.5lf\n", sqrt((double)(x * x + y * y)));
  return 0;
}