#define _GLIBCXX_DEBUG
#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++;
    if(S[i] == 'E') X++;
    if(S[i] == 'W') X--;
    if(S[i] == 'S') Y--;
  }
  double ans = 0.0;
  ans = sqrt(X*X+Y*Y);
  cout << setprecision(5) << ans << endl;
}