#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  string S;
  cin>>S;
  int x=0,y=0;
  for(int i=0;i<S.size();i++){
      if(S[i] == 'N') x++;
      if(S[i] == 'S') x--;
      if(S[i] == 'E') y++;
      if(S[i] == 'W') y--;
  }
  cout<<fixed<<setprecision(15);
  cout<<sqrt(x*x+y*y)<<endl;
}