#include <bits/stdc++.h>
using namespace std;

int main() {
  int x = 0, y = 0;
  string s;
  cin >> s;
  for (auto& c : s) {
    switch (c) {
      case 'N': y++; break;
      case 'E': x++; break;
      case 'W': x--; break;
      case 'S': y--; break;
    }
  }
  double ans = sqrt(x * x + y * y);
  cout << ans << endl;
  return 0;
}