#include <bits/stdc++.h>
using namespace std;
int main() {
  string S;
  cin >> S;
  int X = 0, Y = 0;
  for (int i = 0; i < int(S.size()); i++) {
    if (S[i] == 'N') {
      Y++;
    } else if (S[i] == 'E') {
      X++;
    } else if (S[i] == 'W') {
      X--;
    } else if (S[i] == 'S') {
      Y--;
    }
  }
  cout << fixed << setprecision(10) << hypot(X, Y) << endl;
  return 0;
}