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