#include <bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
const int MOD = 1000000007;
const int INF = 1e14;
using Graph = vector<vector<int>>;

signed main(){
  int A = 0;
  int B = 0;
  string S;
  cin >> S;
  for( int i = 0; i < S.size(); i++ ){
    if( S[i] == 'N' ) A++;
    else if( S[i] == 'S' ) A--;
    else if( S[i] == 'E' ) B++;
    else B--;
  }

  cout << fixed << setprecision(8);
  double ans = sqrt(A*A+B*B);
  cout << ans << endl;
}