#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int x = 0, y = 0;
  string s;
  cin >> s;
  rep(i, 0, s.size()) {
    if (s[i] == 'N') y++;
    if (s[i] == 'S') y--;
    if (s[i] == 'E') x++;
    if (s[i] == 'W') x--;
  }
  double ans = sqrt(y * y + x * x);
  cout << ans << endl;
  getchar();
}