#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(n);i++)
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
const ll INF=1e18;
const int MOD=1e9+7;

const double pi=acos(-1);

int main(){
  double t=0,y=0;
  string s;
  cin >> s;
  rep(i,s.size()){
    if(s[i]=='N')t++;
    if(s[i]=='S')t--;
    if(s[i]=='E')y++;
    if(s[i]=='W')y--;
  }
  cout << fixed << setprecision(10) << sqrt(t*t+y*y) << endl;
}