#include <bits/stdc++.h>

using namespace std;

int main() {
  string s;
  cin >> s;
  double x = 0, y = 0;
  int n = s.size();
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'N') y += 1;
    if (s[i] == 'S') y -= 1;
    if (s[i] == 'W') x -= 1;
    if (s[i] == 'E') x += 1;
  }

  double ans = sqrt(x * x + y * y);
  cout << fixed << setprecision(10) << ans << '\n';
  return 0;
}