#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
int main(){
      string s;
      cin>>s;
      int x=0,y=0;
      REP(i,s.size()){
            if(s[i]=='S')y--;
            else if(s[i]=='N')y++;
            else if(s[i]=='E')x++;
            else x--;
      }
      printf("%.10f\n",sqrt(x*x+y*y));
}