#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <utility>
#include <list>
#include <functional>
#include <queue>
#include <map>
#include <iterator>
#include <iomanip>
#include <complex>
using namespace std;

using ull = unsigned long long;
using ll = long long;


int main()
{
  string s;
  cin >> s;

  int x = 0;
  int y = 0;

  for(auto&& data : s)
  {
    switch(data)
    {
      case 'W':
        --x;
        break;
      case 'E':
        ++x;
        break;
      case 'N':
        --y;
        break;
      case 'S':
        ++y;
        break;
    }
  }

  cout << fixed << setprecision(10) << hypot(x,y) << endl;
}