#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <functional>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <string>

using namespace std;

int dir['z'+1];
int main() {
  dir['N'] = 0;
  dir['W'] = 1;
  dir['S'] = 2;
  dir['E'] = 3;
  string str;
  cin >> str;
  int dx[] = {0, 1, 0, -1};
  int dy[] = {-1, 0, 1, 0};
  int px, py;
  px = py = 0;
  for (int i = 0; i < str.size(); i++) {
    int p = dir[str[i]];
    px += dx[p];
    py += dy[p];
  }
  cout << fixed << setprecision(5) << hypot(double(px), double(py)) << endl;
}