#include <bits/stdc++.h>
using namespace std;
 
int main(){
   string S;
   cin>>S;
   vector<int> l(2,0);
   for(int i=0;i<S.size();i++){
       if(S[i]=='N'){
           l[1]++;
       }
       else if(S[i]=='S'){
           l[1]--;
       }
       else if(S[i]=='E'){
           l[0]++;
       }
       else if(S[i]=='W'){
           l[0]--;
       }
   }
   cout<<(double)sqrt(l[0]*l[0]+l[1]*l[1])<<endl; 
}